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Real Madrid’s Cristiano Ronaldo grimaces as he is helped up by the referee after falling to the ground during their Spanish first division soccer match against Barcelona at Nou Camp stadium in Barcelona, October 7, 2012 (Credit: Reuters/Albert Gea)

Real Madrid's Cristiano Ronaldo grimaces as he is helped up by the referee after falling to the ground during their Spanish first division soccer match against Barcelona at Nou Camp stadium in Barcelona, October 7, 2012 (Credit: Reuters/Albert Gea)