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While Mirko Filipovic maintains that he retired due to injuries, not because of a pending U.S. Anti-Doping Agency (USADA) suspension, the heavyweight has admitted to taking growth hormone to help his ailing shoulder heal.
“When my shoulder problems started, basic methods like massages and icing the shoulder did not help. Then I went to blood plasma which went straight into my shoulder. With each blood plasma, I had a little mix of growth hormone to make my shoulder heal faster,” Filipovic wrote on his website Thursday.