Anaesthesiologist Aleksandar Stanoevski works in the Intensive Care Unit (ICU) where patients suffering from the coronavirus disease (COVID-19) are treated at Saint Anna hospital in Sofia, Bulgaria, November 27, 2020. REUTERS/Stoyan Nenov

Anaesthesiologist Aleksandar Stanoevski treats a patient suffering from the coronavirus disease (COVID-19) at Saint Anna hospital in Sofia, Bulgaria, November 27, 2020. REUTERS/Stoyan Nenov

Anaesthesiologist Aleksandar Stanoevski takes off his protective suit after treating patients suffering from the coronavirus disease (COVID-19) at Saint Anna hospital in Sofia, Bulgaria, November 27, 2020. REUTERS/Stoyan Nenov

French anaesthesiologist Caroline Tesse, 34, helps her daughter Margaux with her homework in their house in Villeneuve d'Ascq after returning home from a four-day shift at the Intensive Care Unit (ICU) where patients suffering from the coronavirus disease (COVID-19) are treated at Cambrai hospital, France, November 17, 2020. Picture taken November 17, 2020. REUTERS/Pascal Rossignol

French anaesthesiologist Caroline Tesse, 34, talks with her husband David, also a medical professional, and holds her daughter Margaux in her arms at their house in Villeneuve d'Ascq after returning home from a four-day shift at the Intensive Care Unit (ICU) where patients suffering from the coronavirus disease (COVID-19) are treated at Cambrai hospital, France, November 17, 2020. Picture taken, November 17, 2020. REUTERS/Pascal Rossignol

French anaesthesiologist Caroline Tesse, 34, walks with her children Margaux and Louis to school in Villeneuve d'Ascq after returning home from a four-day shift at the Intensive Care Unit (ICU) where patients suffering from the coronavirus disease (COVID-19) are treated at Cambrai hospital, France, November 17, 2020. Picture taken, November 17, 2020. REUTERS/Pascal Rossignol

French anaesthesiologist Caroline Tesse, 34, gives a video call to her daughter Rose during a break in her four-day shift in the Intensive Care Unit (ICU) where patients suffering from the coronavirus disease (COVID-19) are treated at Cambrai hospital, France, November 16, 2020. Picture taken November 16, 2020. REUTERS/Pascal Rossignol

French anaesthesiologist Caroline Tesse, 34, talks with her daughter Margaux during a session to explain her job to the schoolchildren at the primary school in Villeneuve d'Ascq after returning home from a four-day shift at the Intensive Care Unit (ICU) where patients suffering from the coronavirus disease (COVID-19) are treated at Cambrai hospital, France, November 17, 2020. Picture taken, November 17, 2020. REUTERS/Pascal Rossignol

French anaesthesiologist Caroline Tesse, 34, wearing a protectice suit and gloves, holds her stethoscope as she examines a patient in the Intensive Care Unit (ICU) where people suffering from the coronavirus disease (COVID-19) are treated at Cambrai hospital, France, November 14, 2020. Picture taken November 14, 2020. REUTERS/Pascal Rossignol

French anaesthesiologist Caroline Tesse, 34, works in the Intensive Care Unit (ICU) where patients suffering from the coronavirus disease (COVID-19) are treated at Cambrai hospital, France, November 13, 2020. Picture taken November 13, 2020. REUTERS/Pascal Rossignol

French anaesthesiologist Caroline Tesse, 34, wearing a protectice suit and a face mask, examines a patient in the Intensive Care Unit (ICU) where people suffering from the coronavirus disease (COVID-19) are treated at Cambrai hospital, France, November 13, 2020. Picture taken November 13, 2020. REUTERS/Pascal Rossignol

French anaesthesiologist Caroline Tesse, 34, wearing a protective suit and gloves, examines a patient in the Intensive Care Unit (ICU) where people suffering from the coronavirus disease (COVID-19) are treated at Cambrai hospital, France, November 14, 2020. Picture taken November 14, 2020. REUTERS/Pascal Rossignol

French anaesthesiologist Caroline Tesse, 34, does her hair as she works in the Intensive Care Unit (ICU) where patients suffering from the coronavirus disease (COVID-19) are treated at Cambrai hospital, France, November 16, 2020. Picture taken November 16, 2020. REUTERS/Pascal Rossignol

French anaesthesiologist Caroline Tesse, 34, wearing a protectice suit and a face mask, examines a patient in the Intensive Care Unit (ICU) where people suffering from the coronavirus disease (COVID-19) are treated at Cambrai hospital, France, November 14, 2020. Picture taken November 14, 2020. REUTERS/Pascal Rossignol

French anaesthesiologist Caroline Tesse, 34, uses her mug decorated with a picture of her son Louis as she has breakfast in the rest room in the Intensive Care Unit (ICU) where people suffering from the coronavirus disease (COVID-19) are treated at Cambrai hospital, France, November 14, 2020. Picture taken November 14, 2020. REUTERS/Pascal Rossignol

French anaesthesiologist Caroline Tesse, 34, gives a call to her family during her four-day shift in the Intensive Care Unit (ICU) where patients suffering from the coronavirus disease (COVID-19) are treated at Cambrai hospital, France, November 16, 2020. Picture taken November 16, 2020. REUTERS/Pascal Rossignol

French anaesthesiologist Caroline Tesse, 34, has breakfast with colleagues in the rest room in the Intensive Care Unit (ICU) where people suffering from the coronavirus disease (COVID-19) are treated at Cambrai hospital, France, November 14, 2020. Picture taken November 14, 2020. REUTERS/Pascal Rossignol

French anaesthesiologist Caroline Tesse, 34, wearing protectice suits and face mask, works in the Intensive Care Unit (ICU) where people suffering from the coronavirus disease (COVID-19) are treated at Cambrai hospital, France, November 13, 2020. Picture taken November 13, 2020. REUTERS/Pascal Rossignol

French anaesthesiologist Caroline Tesse, 34, jogs with a colleague as she takes a break during a four-day shift in the Intensive Care Unit (ICU) where patients suffering from the coronavirus disease (COVID-19) are treated at Cambrai hospital, France, November 14, 2020. Picture taken November 14, 2020. REUTERS/Pascal Rossignol

French anaesthesiologist Caroline Tesse, 34, works in the Intensive Care Unit (ICU) where patients suffering from the coronavirus disease (COVID-19) are treated at Cambrai hospital, France, November 13, 2020. Picture taken November 13, 2020. REUTERS/Pascal Rossignol

French anaesthesiologist Caroline Tesse, 34, wearing a protective suit and a face mask, examines a patient in the Intensive Care Unit (ICU) where people suffering from the coronavirus disease (COVID-19) are treated at Cambrai hospital, France, November 14, 2020. Picture taken November 14, 2020. REUTERS/Pascal Rossignol

French anaesthesiologist Caroline Tesse, 34, answers to a phone call in a corridor as she works in the Intensive Care Unit (ICU) where patients suffering from the coronavirus disease (COVID-19) are treated at Cambrai hospital, France, November 14, 2020. Picture taken November 14, 2020. REUTERS/Pascal Rossignol

French anaesthesiologist Caroline Tesse, 34, writes on the medical follow-up sheets in the Intensive Care Unit (ICU) where patients suffering from the coronavirus disease (COVID-19) are treated at Cambrai hospital, France, November 14, 2020. Picture taken November 14, 2020. REUTERS/Pascal Rossignol

French anaesthesiologist Caroline Tesse, 34, adjusts her protective glasses as she works in the Intensive Care Unit (ICU) where patients suffering from the coronavirus disease (COVID-19) are treated at Cambrai hospital, France, November 13, 2020. Picture taken November 13, 2020. REUTERS/Pascal Rossignol

REFILE - CORRECTING ANAESTHESIOLOGIST AND RESUSCITATOR'S NAMEAlexander Solodkov, an anaesthesiologist and resuscitator, and Anastasia Solodkova, a nurse anaesthetist, attend a surgery on a 20-day-old infant with congenital heart disease at the Federal Center of Cardiovascular Surgery in the Siberian city of Krasnoyarsk, Russia, September 28, 2016. Picture taken September 28, 2016. REUTERS/Ilya Naymushin

Konstantin Ilinykh (L), an anaesthesiologist and resuscitator, with members of a medical team prepare a 20-day-old infant with congenital heart disease for surgery at the Federal Center of Cardiovascular Surgery in the Siberian city of Krasnoyarsk, Russia, September 28, 2016. Picture taken September 28, 2016. REUTERS/Ilya Naymushin

Konstantin Ilinykh (L), an anaesthesiologist and resuscitator, with members of a medical team prepare a 20-day-old infant with congenital heart disease for surgery at the Federal Center of Cardiovascular Surgery in the Siberian city of Krasnoyarsk, Russia, September 28, 2016. Picture taken September 28, 2016. REUTERS/Ilya Naymushin TPX IMAGES OF THE DAY

Konstantin Ilinykh, an anaesthesiologist and resuscitator, and Anastasia Solodkova, a nurse anaesthetist, attend a surgery on a 20-day-old infant with congenital heart disease at the Federal Center of Cardiovascular Surgery in the Siberian city of Krasnoyarsk, Russia, September 28, 2016. Picture taken September 28, 2016. REUTERS/Ilya Naymushin

Gabriel Granados carries a ball during his physiotherapy session at Mexico City's Nutrition Hospital November 26, 2013. Two years after losing his arms to severe burns, a 53-year-old Mexican man is enjoying a new lease on life thanks to a rare double-arm transplant. Gabriel Granados arms were amputated just below the elbow after receiving a severe electrical shock. But in May 2012, nearly 20 medics, including five plastic surgeons, five nurses and three anaesthesiologists, performed a marathon 17-hour operation to attach two arms donated by a shooting victim. The operation was the first of its kind in Latin America with Granados having recovered the majority of movement in his arm from the operation following an extensive course of rehabilitation. Picture taken on November 26, 2013. REUTERS/Henry Romero (MEXICO - Tags: SOCIETY SCIENCE TECHNOLOGY HEALTH)

Gabriel Granados attends a physiotherapy session with doctors at Mexico City's Nutrition Hospital November 26, 2013. Two years after losing his arms to severe burns, a 53-year-old Mexican man is enjoying a new lease on life thanks to a rare double-arm transplant. Gabriel Granados arms were amputated just below the elbow after receiving a severe electrical shock. But in May 2012, nearly 20 medics, including five plastic surgeons, five nurses and three anaesthesiologists, performed a marathon 17-hour operation to attach two arms donated by a shooting victim. The operation was the first of its kind in Latin America with Granados having recovered the majority of movement in his arm from the operation following an extensive course of rehabilitation. Picture taken on November 26, 2013. REUTERS/Henry Romero (MEXICO - Tags: SOCIETY SCIENCE TECHNOLOGY HEALTH)

Gabriel Granados practices writing on paper during his physiotherapy session at Mexico City's Nutrition Hospital November 26, 2013. Two years after losing his arms to severe burns, a 53-year-old Mexican man is enjoying a new lease on life thanks to a rare double-arm transplant. Gabriel Granados arms were amputated just below the elbow after receiving a severe electrical shock. But in May 2012, nearly 20 medics, including five plastic surgeons, five nurses and three anaesthesiologists, performed a marathon 17-hour operation to attach two arms donated by a shooting victim. The operation was the first of its kind in Latin America with Granados having recovered the majority of movement in his arm from the operation following an extensive course of rehabilitation. Picture taken on November 26, 2013. REUTERS/Henry Romero (MEXICO - Tags: SOCIETY SCIENCE TECHNOLOGY HEALTH)

Gabriel Granados attends a physiotherapy session at Mexico City's Nutrition Hospital November 26, 2013. Two years after losing his arms to severe burns, a 53-year-old Mexican man is enjoying a new lease on life thanks to a rare double-arm transplant. Gabriel Granados arms were amputated just below the elbow after receiving a severe electrical shock. But in May 2012, nearly 20 medics, including five plastic surgeons, five nurses and three anaesthesiologists, performed a marathon 17-hour operation to attach two arms donated by a shooting victim. The operation was the first of its kind in Latin America with Granados having recovered the majority of movement in his arm from the operation following an extensive course of rehabilitation. Picture taken on November 26, 2013. REUTERS/Henry Romero (MEXICO - Tags: SOCIETY SCIENCE TECHNOLOGY HEALTH)

Gabriel Granados attends a physiotherapy session at Mexico City's Nutrition Hospital November 26, 2013. Two years after losing his arms to severe burns, a 53-year-old Mexican man is enjoying a new lease on life thanks to a rare double-arm transplant. Gabriel Granados arms were amputated just below the elbow after receiving a severe electrical shock. But in May 2012, nearly 20 medics, including five plastic surgeons, five nurses and three anaesthesiologists, performed a marathon 17-hour operation to attach two arms donated by a shooting victim. The operation was the first of its kind in Latin America with Granados having recovered the majority of movement in his arm from the operation following an extensive course of rehabilitation. Picture taken on November 26, 2013. REUTERS/Henry Romero (MEXICO - Tags: SOCIETY SCIENCE TECHNOLOGY HEALTH)

Gabriel Granados attends a physiotherapy session at Mexico City's Nutrition Hospital November 26, 2013. Two years after losing his arms to severe burns, a 53-year-old Mexican man is enjoying a new lease on life thanks to a rare double-arm transplant. Gabriel Granados arms were amputated just below the elbow after receiving a severe electrical shock. But in May 2012, nearly 20 medics, including five plastic surgeons, five nurses and three anaesthesiologists, performed a marathon 17-hour operation to attach two arms donated by a shooting victim. The operation was the first of its kind in Latin America with Granados having recovered the majority of movement in his arm from the operation following an extensive course of rehabilitation. Picture taken on November 26, 2013. REUTERS/Henry Romero (MEXICO - Tags: SOCIETY SCIENCE TECHNOLOGY HEALTH)

Gabriel Granados attends a physiotherapy session at Mexico City's Nutrition Hospital November 26, 2013. Two years after losing his arms to severe burns, a 53-year-old Mexican man is enjoying a new lease on life thanks to a rare double-arm transplant. Gabriel Granados arms were amputated just below the elbow after receiving a severe electrical shock. But in May 2012, nearly 20 medics, including five plastic surgeons, five nurses and three anaesthesiologists, performed a marathon 17-hour operation to attach two arms donated by a shooting victim. The operation was the first of its kind in Latin America with Granados having recovered the majority of movement in his arm from the operation following an extensive course of rehabilitation. Picture taken on November 26, 2013. REUTERS/Henry Romero (MEXICO - Tags: SOCIETY SCIENCE TECHNOLOGY HEALTH)

Gabriel Granados is seen during his physiotherapy session with a doctor at Mexico City's Nutrition Hospital November 26, 2013. Two years after losing his arms to severe burns, a 53-year-old Mexican man is enjoying a new lease on life thanks to a rare double-arm transplant. Gabriel Granados arms were amputated just below the elbow after receiving a severe electrical shock. But in May 2012, nearly 20 medics, including five plastic surgeons, five nurses and three anaesthesiologists, performed a marathon 17-hour operation to attach two arms donated by a shooting victim. The operation was the first of its kind in Latin America with Granados having recovered the majority of movement in his arm from the operation following an extensive course of rehabilitation. Picture taken on November 26, 2013. REUTERS/Henry Romero (MEXICO - Tags: SOCIETY SCIENCE TECHNOLOGY HEALTH)

Gabriel Granados is seen during a physiotherapy session with a doctor at Mexico City's Nutrition Hospital November 26, 2013. Two years after losing his arms to severe burns, a 53-year-old Mexican man is enjoying a new lease on life thanks to a rare double-arm transplant. Gabriel Granados arms were amputated just below the elbow after receiving a severe electrical shock. But in May 2012, nearly 20 medics, including five plastic surgeons, five nurses and three anaesthesiologists, performed a marathon 17-hour operation to attach two arms donated by a shooting victim. The operation was the first of its kind in Latin America with Granados having recovered the majority of movement in his arm from the operation following an extensive course of rehabilitation. Picture taken on November 26, 2013. REUTERS/Henry Romero (MEXICO - Tags: SOCIETY SCIENCE TECHNOLOGY)

Gabriel Granados (R) is checked by plastic surgery specialist Martin Iglesias during a consultation at a hospital in Mexico City November 26, 2013. Two years after losing his arms to severe burns, a 53-year-old Mexican man is enjoying a new lease on life thanks to a rare double-arm transplant. Gabriel Granados arms were amputated just below the elbow after receiving a severe electrical shock. But in May 2012, nearly 20 medics, including five plastic surgeons, five nurses and three anaesthesiologists, performed a marathon 17-hour operation to attach two arms donated by a shooting victim. The operation was the first of its kind in Latin America with Granados having recovered the majority of movement in his arm from the operation following an extensive course of rehabilitation. Picture taken on November 26, 2013. REUTERS/Henry Romero (MEXICO - Tags: SOCIETY SCIENCE TECHNOLOGY HEALTH)

Gabriel Granados attends a physiotherapy session at Mexico City's Nutrition Hospital November 26, 2013. Two years after losing his arms to severe burns, a 53-year-old Mexican man is enjoying a new lease on life thanks to a rare double-arm transplant. Gabriel Granados arms were amputated just below the elbow after receiving a severe electrical shock. But in May 2012, nearly 20 medics, including five plastic surgeons, five nurses and three anaesthesiologists, performed a marathon 17-hour operation to attach two arms donated by a shooting victim. The operation was the first of its kind in Latin America with Granados having recovered the majority of movement in his arm from the operation following an extensive course of rehabilitation. Picture taken on November 26, 2013. REUTERS/Henry Romero (MEXICO - Tags: SOCIETY SCIENCE TECHNOLOGY HEALTH TPX IMAGES OF THE DAY)

Jazmine Raygoza, 17, (C) starts to wake up in the hands of anaesthesiologist Andrea Grilli (L) as Surgical First Assistant Tony Covello finishes up her gastric banding operation at Rose Medical Center in Denver in this June 20, 2011 file photo. Picture taken June 20, 2011. REUTERS/Rick Wilking (UNITED STATES - Tags: HEALTH SOCIETY)

ATTENTION EDITORS: PICTURE 04 OF 18 FOR PICTURES PACKAGE 'JAZMINE'S TRANSFORMATION'

A picture of a propofol bottle found in Michael Jackson's home is projected onto a screen as defense attorney J. Michael Flanagan (L) questions Dr. Paul White (not pictured), an anaesthesiologist and propofol expert, during the final stage of Dr. Conrad Murray's defense case at Murray's involuntary manslaughter trial in Los Angeles October 28, 2011. Murray, who has pleaded not guilty, faces up to four years in prison if convicted in Michael Jackson's death. REUTERS/Paul Buck/Pool (UNITED STATES - Tags: CRIME LAW ENTERTAINMENT)

Dr. Paul White, an anaesthesiologist and propofol expert, holds a bottle of propofol in the final stage of Dr. Conrad Murray's defense case, during Murray's involuntary manslaughter trial in Los Angeles October 28, 2011. Murray, who has pleaded not guilty, faces up to four years in prison if convicted in Michael Jackson's death. REUTERS/Paul Buck/Pool (UNITED STATES - Tags: CRIME LAW ENTERTAINMENT)

Dr. Paul White (R), an anaesthesiologist and propofol expert, demonstrates an IV drip with the assistance of defense attorney J. Michael Flanagan (L) in the final stage of Dr. Conrad Murray's defense case, during Murray's involuntary manslaughter trial in Los Angeles October 28, 2011. Murray, who has pleaded not guilty, faces up to four years in prison if convicted in Michael Jackson's death. REUTERS/Paul Buck/Pool (UNITED STATES - Tags: CRIME LAW ENTERTAINMENT)

Dr. Conrad Murray listens as defense attorney J. Michael Flanagan (not pictured) questions witness Dr. Paul White, an anaesthesiologist and propofol expert, in the final stage of Murray's defense case, during his involuntary manslaughter trial in Los Angeles October 28, 2011. Murray, who has pleaded not guilty, faces up to four years in prison if convicted in Michael Jackson's death. REUTERS/Paul Buck/Pool (UNITED STATES - Tags: CRIME LAW ENTERTAINMENT)

Dr. Paul White, an anaesthesiologist and propofol expert, holds up an IV drip in the final stage of Dr. Conrad Murray's defense case, during Murray's involuntary manslaughter trial in Los Angeles October 28, 2011. Murray, who has pleaded not guilty, faces up to four years in prison if convicted in Michael Jackson's death. REUTERS/Paul Buck/Pool (UNITED STATES - Tags: CRIME LAW ENTERTAINMENT)

Dr. Paul White (C), an anaesthesiologist and propofol expert, demonstrates an IV drip with the assistance of defense attorney J. Michael Flanagan (L) in the final stage of Dr. Conrad Murray's defense case, during Murray's involuntary manslaughter trial in Los Angeles October 28, 2011. Murray, who has pleaded not guilty, faces up to four years in prison if convicted in Michael Jackson's death. REUTERS/Paul Buck/Pool (UNITED STATES - Tags: CRIME LAW ENTERTAINMENT)

Dr. Paul White (C), an anaesthesiologist and propofol expert, demonstrates an IV drip with the assistance of defense attorney J. Michael Flanagan (L) in the final stage of Dr. Conrad Murray's defense case, during Murray's involuntary manslaughter trial in Los Angeles October 28, 2011. Murray, who has pleaded not guilty, faces up to four years in prison if convicted in Michael Jackson's death. REUTERS/Paul Buck/Pool (UNITED STATES - Tags: CRIME LAW ENTERTAINMENT)

Dr. Paul White, an anaesthesiologist and propofol expert, demonstrates how propofol is loaded into a syringe in the final stage of Dr. Conrad Murray's defense case, during Murray's involuntary manslaughter trial, in Los Angeles October 28, 2011. Murray, who has pleaded not guilty, faces up to four years in prison if convicted in Michael Jackson's death. REUTERS/Paul Buck/Pool (UNITED STATES - Tags: CRIME LAW ENTERTAINMENT)

A medical chart titled "Summary of Positive Toxicological Findings: Jackson, Michael Joseph" is projected onto a screen during the questioning of witness Dr. Paul White, an anaesthesiologist and propofol expert, in the final stage of Dr. Conrad Murray's defense case at Murray's involuntary manslaughter trial in Los Angeles October 28, 2011. Murray, who has pleaded not guilty, faces up to four years in prison if convicted in Michael Jackson's death. REUTERS/Paul Buck/Pool (UNITED STATES - Tags: CRIME LAW ENTERTAINMENT)

A medical chart is projected onto a screen as defense attorney J. Michael Flanagan questions witness Dr. Paul White, an anaesthesiologist and propofol expert, in the final stage of Dr. Conrad Murray's defense case, during Murray's involuntary manslaughter trial, in Los Angeles October 28, 2011. Murray, who has pleaded not guilty, faces up to four years in prison if convicted in Michael Jackson's death. REUTERS/Paul Buck/Pool (UNITED STATES - Tags: CRIME LAW ENTERTAINMENT)

A medical chart is projected onto a screen as defense attorney J. Michael Flanagan questions witness Dr. Paul White, an anaesthesiologist and propofol expert, in the final stage of Dr. Conrad Murray's defense case, during Murray's involuntary manslaughter trial, in Los Angeles October 28, 2011. Murray, who has pleaded not guilty, faces up to four years in prison if convicted in Michael Jackson's death. REUTERS/Paul Buck/Pool (UNITED STATES - Tags: CRIME LAW ENTERTAINMENT)

Defense attorney J. Michael Flanagan questions witness Dr. Paul White, an anaesthesiologist and propofol expert, in the final stage of Dr. Conrad Murray's defense case, during Murray's involuntary manslaughter trial in Los Angeles October 28, 2011. Murray, who has pleaded not guilty, faces up to four years in prison if convicted in Michael Jackson's death. REUTERS/Paul Buck/Pool (UNITED STATES - Tags: CRIME LAW ENTERTAINMENT)

Dr. Conrad Murray (L) listens as defense attorney J. Michael Flanagan (R) questions witness Dr. Paul White, an anaesthesiologist and propofol expert, in the final stage of Murray's defense case during his involuntary manslaughter trial in Los Angeles October 28, 2011. Murray, who has pleaded not guilty, faces up to four years in prison if convicted in Michael Jackson's death. REUTERS/Paul Buck/Pool (UNITED STATES - Tags: CRIME LAW ENTERTAINMENT)

Dr. Paul White, an anaesthesiologist and propofol expert, testifies during the final stage of Dr. Conrad Murray's defense case, at Murray's involuntary manslaughter trial, in Los Angeles October 28, 2011. Murray, who has pleaded not guilty, faces up to four years in prison if convicted in Michael Jackson's death. REUTERS/Paul Buck/Pool (UNITED STATES - Tags: CRIME LAW ENTERTAINMENT)

A medical chart is projected onto a screen as defense attorney J. Michael Flanagan questions witness Dr. Paul White, an anaesthesiologist and propofol expert, during the final stage of Dr. Conrad Murray's (L) defense case, at Murray's involuntary manslaughter trial, in Los Angeles October 28, 2011. Murray, who has pleaded not guilty, faces up to four years in prison if convicted in Michael Jackson's death. REUTERS/Paul Buck/Pool (UNITED STATES - Tags: CRIME LAW ENTERTAINMENT)

Anesthesiologist Dr. Barry Friedberg, displaying IV's used in his trade, talks to the media outside the courthouse during Dr. Conrad Murray's trial in the death of pop star Michael Jackson in Los Angeles September 28, 2011. REUTERS/Mario Anzuoni (UNITED STATES - Tags: ENTERTAINMENT CRIME LAW)

French Gendarmes stand guard, as nurse-anaesthesiologists protest against hospital working conditions near the French Foreign Ministry in Paris June 8, 2010. REUTERS/Gonzalo Fuentes (FRANCE - Tags: POLITICS EMPLOYMENT BUSINESS CIVIL UNREST HEALTH)

French Gendarmes stand guard as nurse-anaesthesiologists protest against hospital working conditions near the French Foreign Ministry in Paris June 8, 2010. REUTERS/Gonzalo Fuentes (FRANCE - Tags: POLITICS EMPLOYMENT BUSINESS CIVIL UNREST HEALTH)

Nurse-anaesthesiologists protest against hospital working conditions near the French Foreign Ministry in Paris June 8, 2010. REUTERS/Gonzalo Fuentes (FRANCE - Tags: POLITICS EMPLOYMENT BUSINESS CIVIL UNREST HEALTH)