Doping - using drug or blood products to improve athletic performance - has now become a public health problem, and not just a sporting one, experts explained at an anti-doping conference organized by the Arne Ljungqvist Foundation.

Dr. Timothy Armstrong, who works at WHO (World Health Organization) explained that about 3% of high school boys in America regularly take growth hormones or steroids. This amounts to a very large number of people and is definitely a public health problem, he added.

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