Cielo's knees in golden form
By Agence France-Presse in Barcelona | China Daily | Updated:  2013-07-31 07:23
 
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 Cesar Cielo celebrates winning the men's 50m butterfly final on Monday. Albert Gea / Reuters  | 
Brazil's Cesar Cielo admitted he was relieved to have retained his men's 50m butterfly title on Monday at swimming's world championships, just 10 months after surgery on both knees.
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