Athens' Polytechnic School students carry a blood-stained Greek flag during a rally marking the 43rd anniversary of a 1973 student uprising against the military dictatorship that was ruling Greece, in Athens, Greece, November 17, 2016. REUTERS/Alkis Konstantinidis

ATTENTION EDITORS - VISUALS COVERAGE OF SCENES OF DEATH OR INJURY A Yazidi man is injured from a bomb attack in the town of Bashiqa, after it was recaptured from the Islamic State, east of Mosul, Iraq November 10, 2016. REUTERS/Alaa Al-Marjani 

A blood stain is pictured near a hat on the ground after a strike on the rebel held besieged city of Douma, in the eastern Damascus suburb of Ghouta, Syria, November 8, 2016. REUTERS/Bassam Khabieh 

Blood stains the ground after a strike on the rebel held besieged city of Douma, in the eastern Damascus suburb of Ghouta, Syria, November 8, 2016. REUTERS/Bassam Khabieh 

Football Soccer -Panathinaikos v Standard Liege - Europa League Group Stage - Apostolos Nikolaidis stadium, Athens, Greece - 03/11/2016. An injured riot police officer reacts during clashes with Standard Liege fans. REUTERS/Alkis Konstantinidis TPX IMAGES OF THE DAY

Football Soccer -Panathinaikos v Standard Liege - Europa League Group Stage - Apostolos Nikolaidis stadium, Athens, Greece - 03/11/2016. An injured riot police officer reacts during clashes with Standard Liege fans. REUTERS/Alkis Konstantinidis 

Football Soccer -Panathinaikos v Standard Liege - Europa League Group Stage - Apostolos Nikolaidis stadium, Athens, Greece - 03/11/2016. An injured riot police officer reacts during clashes with Standard Liege fans. REUTERS/Alkis Konstantinidis TPX IMAGES OF THE DAY

A man walks inside a room in which five people were killed in Manila, Philippines early November 1, 2016. According to police and witnesses, unknown masked gunmen killed five people inside a house that is a known drug den. REUTERS/Damir Sagolj REUTERS/Damir Sagolj 

An injured supporter of Pakistani opposition leader Imran Khan sits in an ambulance after clashes between police and protesters in Swabi, between Peshawar and Islamabad, Pakistan October 31, 2016. REUTERS/Fayaz Aziz 

An injured Venezuelan National Guard walks away during a rally demanding a referendum to remove Venezuela's President Nicolas Maduro in San Cristobal, Venezuela October 26, 2016. REUTERS/Carlos Eduardo Ramirez 

ATTENTION EDITORS - VISUAL COVERAGE OF SCENES OF INJURY OR DEATH A policeman holds a bag with bloodied doll and other belongings of a 17 year old girl that was killed together with her friend by unknown motorcycle-riding gunmen in an alley in Manila, Philippines early October 26, 2016. According to the police, a sign on a cardboard reading "Tulak ka, hayop ka", which translates to "You are a (drug) pusher, you are an animal" was found with the the body of girl's killed friend. REUTERS/Damir Sagolj

A Kurdish Peshmerga fighter is seen bloodied following a road side bomb on their vehicle during a battle with Islamic State militants at Topzawa village near Bashiqa, near Mosul, Iraq October 24, 2016. REUTERS/Ahmed Jadallah 

A Kurdish Peshmerga fighter is seen bloodied following a road side bomb attack on their vehicle during a battle with Islamic State militants at Topzawa village, near Bashiqa, near Mosul, Iraq October 24, 2016. REUTERS/Ahmed Jadallah 

REFILE - UPDATING CAPTION TO REUTERS STYLE A Kashmiri Shi'ite Muslim bleeds after he flagellated himself during a Muharram procession to mark Ashura in Srinagar October 12, 2016. REUTERS/Danish Ismail TPX IMAGES OF THE DAY

Football Soccer - Brazil v Bolivia - World Cup 2018 Qualifier - Dunas Arena Stadium, Natal, Brazil - 6/10/16. Brazil's Neymar injured. REUTERS/Ricardo Moraes

Britain Football Soccer - AFC Bournemouth v Everton - Premier League - Vitality Stadium - 24/9/16
Bournemouth's Adam Smith with an injury to his face
Reuters / Hannah McKay
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Britain Football Soccer - AFC Bournemouth v Everton - Premier League - Vitality Stadium - 24/9/16
Bournemouth's Adam Smith with an injury to his face
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Britain Football Soccer - AFC Bournemouth v Everton - Premier League - Vitality Stadium - 24/9/16
Bournemouth's Adam Smith with an injury to his face
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Britain Football Soccer - AFC Bournemouth v Everton - Premier League - Vitality Stadium - 24/9/16
Bournemouth's Adam Smith with an injury to his face
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Britain Football Soccer - AFC Bournemouth v Everton - Premier League - Vitality Stadium - 24/9/16
Bournemouth's Adam Smith with an injury to his face
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Butchers slaughter sheep during the first day of Eid al-Adha celebrations in the rebel held Madyara neighbourhood of Damascus, Syria September 12, 2016. REUTERS/Bassam Khabieh 

Slaughtered sheep are pictured on the first day of Eid al-Adha celebrations in the rebel held Douma neighbourhood of Damascus, Syria September 12, 2016. REUTERS/Bassam Khabieh 

Butchers slaughter sheep during the first day of Eid al-Adha celebrations in the rebel held Madyara neighbourhood of Damascus, Syria September 12, 2016. REUTERS/Bassam Khabieh 

Carita is pictured at the Famproa dogs shelter in Los Teques, Venezuela August 18, 2016. "She arrived at the shelter almost dead and completely covered with scabies, to the point that her face bled. Carita is very aggressive, attacks any dog who is close and during fights has killed several. So now she has to live locked in a kennel," said Maria Silva who takes care of dogs at the shelter. REUTERS/Carlos Garcia Rawlins SEARCH "DOG LIFE" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES. 

An injured man is helped after clashes with the police during a rally to demand a referendum to remove Venezuela's President Nicolas Maduro in Caracas, Venezuela, September 1, 2016. REUTERS/Marco Bello 

Football Soccer Britain - Sheffield Wednesday v Aston Villa - Sky Bet Championship - Hillsborough - 7/8/16
Aston Villa's Tommy Elphick receives treatment after sustaining a injury following a collision with Sheffield Wednesday's Steven Fletcher
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Football Soccer Britain - Sheffield Wednesday v Aston Villa - Sky Bet Championship - Hillsborough - 7/8/16
Sheffield Wednesday's Steven Fletcher receives treatment after sustaining a injury following a collision with Aston Villa's Tommy Elphick
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Football Soccer Britain - Sheffield Wednesday v Aston Villa - Sky Bet Championship - Hillsborough - 7/8/16
Sheffield Wednesday's Steven Fletcher receives treatment after sustaining a injury following a collision with Aston Villa's Tommy Elphick
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A protester has a scratch in his leg inspected during demonstrations near the Republican National Convention in Cleveland, Ohio, U.S., July 19, 2016. REUTERS/Lucas Jackson

Britain Football Soccer - North Ferriby United v Hull City - Pre Season Friendly - Eon Visual Media Stadium - 16/7/16
Robbie McKenzie of Hull City after sustaining an injury
Action Images via Reuters / Ed Sykes
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ATTENTION EDITORS - VISUAL COVERAGE OF SCENES OF INJURY OR DEATH Men carry an injured girl after an airstrike on Aleppo's rebel held Kadi Askar area, Syria July 8, 2016. REUTERS/Abdalrhman Ismail 

An injured riot policeman is seen through a police vehicle window as they clash with demonstrators during an unauthorized march called by the Chilean student federations to protest against government's education reform, in Santiago, Chile July 5, 2016. REUTERS/Ivan Alvarado 

An injured riot policeman is seen through a police vehicle window as they clash with demonstrators during an unauthorized march called by the Chilean student federations to protest against government's education reform, in Santiago, Chile July 5, 2016. REUTERS/Ivan Alvarado 

Football Soccer - Slovakia v England - EURO 2016 - Group B - Stade Geoffroy-Guichard, Saint-?tienne, France - 20/6/16
Slovakia's Peter Pekarik after sustaining a injury
REUTERS/Kai Pfaffenbach
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Football Soccer - Slovakia v England - EURO 2016 - Group B - Stade Geoffroy-Guichard, Saint-?tienne, France - 20/6/16
Slovakia's Peter Pekarik receives treatment after sustaining a injury
REUTERS/Kai Pfaffenbach
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Football Soccer - Turkey v Croatia - EURO 2016 - Group D - Parc des Princes, Paris, France - 12/6/16
Croatia's Vedran Corluka with a head injury
REUTERS/John Sibley
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Football Soccer - Turkey v Croatia - EURO 2016 - Group D - Parc des Princes, Paris, France - 12/6/16Croatia's Vedran Corluka with a head injuryREUTERS/Christian HartmannLivepic TPX IMAGES OF THE DAY 

Football Soccer - Turkey v Croatia - EURO 2016 - Group D - Parc des Princes, Paris, France - 12/6/16
Croatia's Vedran Corluka with a head injury
REUTERS/Darren Staples
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Football Soccer - Turkey v Croatia - EURO 2016 - Group D - Parc des Princes, Paris, France - 12/6/16
Croatia's Vedran Corluka with a head injury
REUTERS/Darren Staples
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Football Soccer - Turkey v Croatia - EURO 2016 - Group D - Parc des Princes, Paris, France - 12/6/16
Croatia's Vedran Corluka with a head injury
REUTERS/Darren Staples
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Football Soccer - Turkey v Croatia - EURO 2016 - Group D - Parc des Princes, Paris, France - 12/6/16
Croatia's Vedran Corluka with a head injury
REUTERS/Darren Staples
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Football Soccer - Turkey v Croatia - EURO 2016 - Group D - Parc des Princes, Paris, France - 12/6/16
Croatia's Vedran Corluka with a head injury
REUTERS/Christian Hartmann
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Football Soccer - Italy v Finland - International Friendly - Bentegodi stadium, Verona, Italy - 06/06/16 Italy's Ciro Immobile bleeds as he leaves the pitch at the end of the match against Finland. REUTERS/Giorgio Perottino 

ATTENTION EDITORS - VISUAL COVERAGE OF SCENES OF INJURY OR DEATHKurdish Peshmerga forces inspect a wounded soldier in a village east of Mosul, Iraq, May 29, 2016. REUTERS/Azad Lashkari TPX IMAGES OF THE DAY 

Anti-government protesters carry an injured man as they storm Baghdad's Green Zone in Iraq May 20, 2016. REUTERS/Khalid al Mousily TPX IMAGES OF THE DAY

Anti-government protesters carry an injured during storm Baghdad's Green Zone in Iraq May 20, 2016. REUTERS/Khalid al Mousily TPX IMAGES OF THE DAY

ATTENTION EDITORS - VISUAL COVERAGE OF SCENES OF INJURY An injured woman reacts at a site hit by airstrikes in the rebel held area of Old Aleppo, Syria, April 28, 2016. REUTERS/Abdalrhman Ismail 

ATTENTION EDITORS - VISUAL COVERAGE OF SCENES OF INJURYAn injured woman reacts at a site hit by airstrikes in the rebel held area of Old Aleppo, Syria, April 28, 2016. REUTERS/Abdalrhman Ismail TPX IMAGES OF THE DAY 

ATTENTION EDITORS - VISUAL COVERAGE OF SCENES OF INJURYAn injured woman reacts at a site hit by airstrikes in the rebel held area of Old Aleppo, Syria, April 28, 2016. REUTERS/Abdalrhman Ismail TPX IMAGES OF THE DAY 

Athletics - 2016 Virgin Money London Marathon - London - 24/4/16
Kenya's Jemima Sumgong has a cut to the head after she fell on her way to winning the women's race
Action Images via Reuters / Paul Childs
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A protester bleeds from his lip after being struck by a supporter of Republican U.S. presidential candidate Donald Trump at a protest against Trump in midtown Manhattan in New York City, April 14, 2016. REUTERS/Mike Segar 

A participant takes part in a zombie parade during the Brussels International Fantastic Film Festival in Brussels, Belgium, April 9, 2016. REUTERS/Yves Herman 

A supporter of former Brazilian president Luiz Inacio Lula da Silva is detained by a police officer during a protest in front of Lula's apartment in Sao Bernardo do Campo, Brazil, March 4, 2016. REUTERS/Paulo Whitaker 

An unidentified injured man is escorted by riot police at Mongkok in Hong Kong, China February 9, 2016. Riot police used batons and pepper spray early on Tuesday to quell fights after authorities tried to move illegal street vendors from a working-class Hong Kong district, the worst street clashes since pro-democracy protests in late 2014. It is not known whether the injured man is a protester. REUTERS/Bobby Yip TPX IMAGES OF THE DAY

Germany's Alexander Zverev reacts as he receives medical treatment for a bleeding nose during his first round match against Britain's Andy Murray at the Australian Open tennis tournament at Melbourne Park, Australia, January 19, 2016. REUTERS/Jason Reed 

Germany's Alexander Zverev receives medical treatment for a bleeding nose during his first round match against Britain's Andy Murray at the Australian Open tennis tournament at Melbourne Park, Australia, January 19, 2016. REUTERS/Jason Reed 

Germany's Alexander Zverev receives medical treatment for a bleeding nose during his first round match against Britain's Andy Murray at the Australian Open tennis tournament at Melbourne Park, Australia, January 19, 2016. REUTERS/Jason Reed 

An injured demonstrators shows his head with blood as he attends a protest against fare hikes for city buses in Sao Paulo, Brazil, January 12, 2016. Brazilian riot police on Tuesday fired tear gas and stun grenades to disperse a protest against a rise in public transport fares in the country's largest city, Sao Paulo. REUTERS/Paulo Whitaker 

Novak Djokovic of Serbia bleeds from his right wrist after falling in the first set against Roger Federer of Switzerland during their men's singles final match at the U.S. Open Championships tennis tournament in New York, September 13, 2015. REUTERS/Mike Segar 

Rugby Union - England v Ireland - QBE International - Twickenham Stadium, London, England - 5/9/15
Geoff Parling of England with a cut to his head
Action Images via Reuters / Henry Browne