Cardiology technician Patricia Gago (C) and cardiac patients take part in a tango workshop in Buenos Aires August 6, 2012. Tango lessons are added to the rehabilitation routines, which include tape and bicycle exercises, for patients who suffered heart attacks, heart disease or have heart pacemakers, the head of rehabilitation in the Paroissien public state hospital, Alberto Marani said. REUTERS/Enrique Marcarian (ARGENTINA - Tags: HEALTH SOCIETY) 

Cardiac patients take part in a tango workshop in Buenos Aires August 6, 2012. Tango lessons are added to the rehabilitation routines, which include tape and bicycle exercises, for patients who suffered heart attacks, heart disease or have heart pacemakers, the head of rehabilitation in the Paroissien public state hospital, Alberto Marani said. REUTERS/Enrique Marcarian (ARGENTINA - Tags: HEALTH SOCIETY) 

Bolton Wanderers' Nigel Reo-Coker helps a member of the club's medical staff attend to Fabrice Muamba after he collapsed on the pitch during their FA Cup quarter-final soccer match against Tottenham Hotspur at White Hart Lane in London March 17, 2012. Tottenham Hotspur's FA Cup quarter-final against Bolton Wanderers was abandoned on Saturday after Bolton midfielder Fabrice Muamba collapsed near the centre circle. REUTERS/Suzanne Plunkett (BRITAIN - Tags: SPORT SOCCER TPX IMAGES OF THE DAY) 

Sevilla's midfielder Antonio Puerta (C) leaves the field assisted by a doctor, after collapsing and appearing to lose consciousness momentarily, during their Spanish first division soccer match against Getafe at Ramon Sanchez Pizjuan stadium in Seville August 25, 2007. Puerta died in hospital three days after collapsing during a La Liga match in 2007 at the age of 22 and his death sparked a new law that all first- and second-division clubs should keep defibrillators ready at their grounds. Picture taken August 25, 2007. To match feature SOCCER-SPAIN/HEART REUTERS/Marcelo del Pozo (SPAIN - Tags: SPORT SOCCER HEALTH) 

A picture of Sevilla midfielder Antonio Puerta is placed among candles at the club's Ramon Sanchez Pizjuan stadium in Seville August 28, 2007. Puerta died in hospital three days after collapsing during a La Liga match in 2007 at the age of 22 and his death sparked a new law that all first- and second-division clubs should keep defibrillators ready at their grounds. Picture taken August 28, 2007. To match feature SOCCER-SPAIN/HEART REUTERS/Marcelo del Pozo (SPAIN - Tags: SPORT SOCCER HEALTH) 

Patrons eat at a taco stand, as the body of a man lies on the pavement, in Ciudad Obregon August 10, 2010. According to local media, the man died after suffering a fatal heart attack. Picture taken August 10, 2010. REUTERS/Francisco Gonzalez Bolon/Expreso (MEXICO - Tags: SOCIETY IMAGES OF THE DAY) FOR EDITORIAL USE ONLY. NOT FOR SALE FOR MARKETING OR ADVERTISING CAMPAIGNS BEST QUALITY AVAILABLE 

CHENEY-HEART/ - Diagram explaining the HeartMate II heart pump device that U.S. media report former U.S. Vice President has had implanted. RNGS. (SIN05) 

The quadruple bypass cheese burger is displayed at Heart Attack Grill in Chandler, Arizona June 17, 2009. The restaurant is known for its hospital theme and triple and quadruple bypass burgers. REUTERS/Joshua Lott (UNITED STATES) 

Fans sign a poster of singer James Brown outside B.B. King's Blues Club and Grill in New York December 26, 2006. The legendary soul singer died of heart failure from pneumonia on Christmas day. REUTERS/Eric Thayer (UNITED STATES) 

Lorenzo Dawson, a fan of singer James Brown, sits on a park bench near the singer's statue in his hometown of Augusta, Georgia, December 25, 2006. Brown, known around the world as the "Godfather of Soul", died early Christmas morning in Atlanta aged 73. REUTERS/Jonathan Ernst (UNITED STATES) 

Venisha Brown (R) hugs a friend at the base of a statue of her father, deceased singer James Brown, in his hometown of Augusta, Georgia, December 25, 2006. James Brown, known around the world as the "Godfather of Soul", died early Christmas morning in Atlanta. REUTERS/Jonathan Ernst (UNITED STATES)