Technoglitch
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Jessica Ennis-Hill's coach Toni Minichiello has questioned why no action was taken over data suggesting widespread doping in elite athletics.
The Sunday Times published data from 5,000 athletes, which it says reveals an "extraordinary extent of cheating".
Minichiello says he reacted with initial "confusion", adding: "My question is, why has nobody acted upon it and who should have done that?"
He urged the sport's governing body to examine its "internal mechanisms".
Minichiello said the data casts a "sad shadow" over the World Championships in Beijing, which begin on 22 August.
The blood test data, which covers the period between 2001 and 2012 and belongs to the International Association of Athletics Federations (IAAF), was leaked by a whistle-blower to a German broadcaster and the Sunday Times.
The files show a third of all medals in endurance events at Olympics and World Championships in that period were won by athletes who recorded suspicious tests, according to independent experts who have analysed the data.
BBC Sport - Leaked IAAF doping files: Toni Minichiello questions lack of action
The Sunday Times published data from 5,000 athletes, which it says reveals an "extraordinary extent of cheating".
Minichiello says he reacted with initial "confusion", adding: "My question is, why has nobody acted upon it and who should have done that?"
He urged the sport's governing body to examine its "internal mechanisms".
Minichiello said the data casts a "sad shadow" over the World Championships in Beijing, which begin on 22 August.
The blood test data, which covers the period between 2001 and 2012 and belongs to the International Association of Athletics Federations (IAAF), was leaked by a whistle-blower to a German broadcaster and the Sunday Times.
The files show a third of all medals in endurance events at Olympics and World Championships in that period were won by athletes who recorded suspicious tests, according to independent experts who have analysed the data.
BBC Sport - Leaked IAAF doping files: Toni Minichiello questions lack of action