Berlin (dpa) — The World Anti-Doping Agency has found no credible evidence of misconduct in the decision to clear 23 Chinese swimmers who tested positive for heart drug trimetazidine (TMZ) in 2021, it said on Monday. WADA was forced to hold an emergency press conference to try to stem the tide of negative headlines after the story first emerged from German broadcaster ARD, the New York Times and Australia’s Daily Telegraph. Chinese officials, swimming’s governing body and WADA ruled that the 23 had only tested positive due to contamination and the swimmers were able to qualify for the Tokyo Ol…