Moscow, Nov 21 (IANS): The information on the Therapeutic Use Exemptions (TUEs), provided by the World Anti-Doping Agency (WADA), was modified by hacking group named Fancy Bears before they leaked on the web, WADA Medical Director Alan Vernec has said.

Since September 13, the Fancy Bears hacking collective leaked at least six batches of WADA confidential medical records, including TUE, reports Sputnik.

The athletes given TUEs include Rafael Nadal, Venus and Serena Williams and four-time Rio Olympics gold medallist Simone Biles, among others.

"WADA Medical Director Alan Vernec confirms to Foundation Board that many of the TUEs leaked by Fancy Bears had been modified," WADA stated via its Twitter account.

According to WADA's press service, Vernec said that only one percent of the 11,303 athletes, taking part in the Rio 2016 Olympic Games, had TUEs.

"No evidence of abuse of system," WADA said, citing its medical director.

The WADA Foundation Board meeting, aimed at discussing the future of the world anti-doping system, took place place in the Scottish city of Glasgow on Sunday.