LONDON, Feb 12 (Reuters) - Virtually all the raw materials used by criminal gangs throughout the world to produce illegal performance-enhancing drugs come from China, World Anti-Doping Agency (WADA) director general David Howman said on Tuesday. "Ninety-nine percent of the raw materials that are used through the internet to make up in your kitchen or your backyard laboratory are emanating from China," Howman said in an interview with Reuters television during a WADA media symposium at a London hotel. ... More...