Cuba's Yudelmis Dominguez, Yoanka Gonzalez and Dalila Rodriguez compete to win the silver medal in the women's team pursuit cycling track competition at the Pan American Games in Guadalajara October 18, 2011. REUTERS/Jose Miguel Gomez (MEXICO - Tags: SPORT CYCLING) 

Cuba's Yudelmis Dominguez, Yoanka Gonzalez and Dalila Rodriguez compete to win the silver medal in the women's team pursuit cycling track competition at the Pan American Games in Guadalajara October 18, 2011. REUTERS/Jose Miguel Gomez (MEXICO - Tags: SPORT CYCLING) 

Gold medallist Marianne Vos of the Netherlands (C), silver medallist Yoanka Gonzalez of Cuba (L) and bronze medallist Leire Olaberria of Spain celebrate on the podium after the women's track cycling points race at the Beijing 2008 Olympic Games August 18, 2008. REUTERS/Stefano Rellandini (CHINA) 

Yoanka Gonzalez of Cuba bites her silver medal after finishing second in the women's track cycling points race at the Beijing 2008 Olympic Games August 18, 2008. REUTERS/Stefano Rellandini (CHINA)

Cuban Yoanka Gonzalez competes to win the gold medal at women's points race cycling competition of the Pan American Games in Rio de Janeiro July 19, 2007. REUTERS/Daniel Munoz (BRAZIL) 

Cuban Yoanka Gonzalez celebrates after winning the gold medal in the women's points race cycling competition at the Pan American Games in Rio de Janeiro July 19, 2007. REUTERS/Daniel Munoz (BRAZIL) 

Cuban Yoanka Gonzalez celebrates after winning the gold medal in the women's points race cycling competition at the Pan American Games in Rio de Janeiro July 19, 2007. REUTERS/Daniel Munoz (BRAZIL) 

Gold medallist Yoanka Goonzalez (R) and silver medallist Yusmari Gonzalez, both of Cuba, celebrate after winning the women's points race cycling competition at the 20th Central American and Caribbean Games in Barranquilla, Colombia, July 17, 2006. REUTERS/Daniel Munoz (COLOMBIA) 

Cuban cyclist Yoanka Gonzalez attends a free training session in the Olympic Velodrome in Athens, August 11, 2004. The Athens 2004 Olympic Games will officially open on August 13. REUTERS/Marcelo Del Pozo MDP/DL 

Cuban cyclist Yoanka Gonzalez trains during free training session in the Olympic Velodrome in Athens August 11, 2004. The Athens 2004 Olympic Games will officially open on August 13. REUTERS/Marcelo Del Pozo MDP/DL 

Cuba's Yoanka Gonzalez cycles into the light as she trains at the velodrome in Athens August 10, 2004. The Athens 2004 Olympic Games are set to begin with the opening ceremony on August 13. REUTERS/Jason Reed JIR/AA 

Cuba's Yoanka Gonzalez cycles into the light as she trains at the velodrome in Athens August 10, 2004. The Athens 2004 Olympic Games are set to begin with the opening ceremony on August 13. REUTERS/Jason Reed JIR/AA 

AUSTRALIA'S GILMORE IS TAKEN OFF ON STRETCHER AFTER THE WOMEN'S 10KM SCRATCH RACE FINAL AT THE WORLD CHAMPIONSHIPS IN MELBOURNE. Australia's Rochelle Gilmore (C) is taken off on a stretcher after crashing with Spain's Gema Pascual Torrecilla during the Women's 10km Scratch Race final at the Track Cycling World Championships in Melbourne May 30, 2004. Gilmore was taken to hospital, with Yoanka Gonzalez Perez from Cuba winning the race. More than 200 cyclists from 43 countries will participate in the championships which will include 15 events. The Championships is also the last chance for nations to qualify places for the Athens Olympic Games and for the cyclists their opportunity to earn a place on their respective Olympic teams. REUTERS/Stuart Milligan 

CUBA'S PEREZ CELEBRATES WINNING THE WOMEN'S 10KM SCRATCH RACE FINAL AT THE WORLD CHAMPIONSHIPS IN MELBOURNE. Yoanka Gonzalez Perez from Cuba celebrates winning the Women's 10km Scratch Race final at the Track Cycling World Championships in Melbourne May 30, 2004. Perez won the race ahead of Mandy Poitras from Canada and Olga Slyusareva from Russia in third. More than 200 cyclists from 43 countries will participate in the championships which will include 15 events. The Championships is also the last chance for nations to qualify places for the Athens Olympic Games and for the cyclists their opportunity to earn a place on their respective Olympic teams. REUTERS/David Gray 

AUSTRALIA'S GILMORE IS TAKEN OFF ON STRETCHER AFTER THE WOMEN'S 10KM SCRATCH RACE FINAL AT THE WORLD CHAMPIONSHIPS IN MELBOURNE. Australia's Rochelle Gilmore (C) is taken off on a stretcher after crashing with and Spain's Gema Pascual Torrecilla during the Women's 10km Scratch Race final at the Track Cycling World Championships in Melbourne May 30, 2004. Gilmore was taken to hospital, with Yoanka Gonzalez Perez from Cuba winning the race. More than 200 cyclists from 43 countries will participate in the championships which will include 15 events. The Championships is also the last chance for nations to qualify places for the Athens Olympic Games and for the cyclists their opportunity to earn a place on their respective Olympic teams. REUTERS/David Gray 

Yoanka Gonzalez Perez (R) from Cuba rides among other competitors during the Women's 10km Scratch Race final at the Track Cycling World Championships in Melbourne May 30, 2004. Perez went on to win the race ahead of Mandy Poitras from Canada and Olga Slyusareva from Russia in third. More than 200 cyclists from 43 countries will participate in the championships which will include 15 events. The Championships is also the last chance for nations to qualify places for the Athens Olympic Games and for the cyclists their opportunity to earn a place on their respective Olympic teams. REUTERS/David Gray DG/FA 

AUSTRALIA'S GILMORE AND DURING THE WOMEN'S 10KM SCRATCH RACE FINAL AT THE WORLD CHAMPIONSHIPS IN MELBOURNE. Australia's Rochelle Gilmore (R) and Spain's Gema Pascual Torrecilla (2nd-R) crash during the Women's 15km Scratch Race final at the Track Cycling World Championships in Melbourne May 30, 2004. Gilmore was taken to hospital shortly afterwards, with Yoanka Gonzalez Perez from Cuba winning the race. More than 200 cyclists from 43 countries will participate in the championships which will include 15 events. The Championships is also the last chance for nations to qualify places for the Athens Olympic Games and for the cyclists their opportunity to earn a place on their respective Olympic teams. REUTERS/David Gray 

AUSTRALIA'S GILMORE AND DURING THE WOMEN'S 10KM SCRATCH RACE FINAL AT THE WORLD CHAMPIONSHIPS IN MELBOURNE. Australia's Rochelle Gilmore (R) and Spain's Gema Pascual Torrecilla (L) crash during the Women's 15km Scratch Race final at the Track Cycling World Championships in Melbourne May 30, 2004. Gilmore was taken to hospital shortly afterwards, with Yoanka Gonzalez Perez from Cuba winning the race. More than 200 cyclists from 43 countries will participate in the championships which will include 15 events. The Championships is also the last chance for nations to qualify places for the Athens Olympic Games and for the cyclists their opportunity to earn a place on their respective Olympic teams. REUTERS/David Gray 

AUSTRALIA'S GILMORE AND DURING THE WOMEN'S 10KM SCRATCH RACE FINAL AT THE WORLD CHAMPIONSHIPS IN MELBOURNE. Australia's Rochelle Gilmore (R) and Spain's Gema Pascual Torrecilla (L) crash during the Women's 15km Scratch Race final at the Track Cycling World Championships in Melbourne May 30, 2004. Gilmore was taken to hospital shortly afterwards, with Yoanka Gonzalez Perez from Cuba winning the race. More than 200 cyclists from 43 countries will participate in the championships which will include 15 events. The Championships is also the last chance for nations to qualify places for the Athens Olympic Games and for the cyclists their opportunity to earn a place on their respective Olympic teams. REUTERS/David Gray