LONDON - World athletics chief Sebastian Coe has defended the system of “therapeutic use exemptions” (TUEs) after medical data involving dozens of top sportsmen was leaked by a cyber hacking group. Many of the targeted athletes have been revealed to have received TUEs for the use of substances that would usually be on the World Anti-Doping Agency (WADA) banned list. TUEs can be issued to athletes who have an illness or condition that requires the use of normally prohibited medication. Coe told BBC Radio 5 Live’s Sportsweek programme on Sunday: “I think the TUEs system is a good system. Do we have to make sure that it is not being abused? Yes, of course. There is potential for that (exploitation), but I don’t think it is commonly the case,” added British middle-distance great Coe.