This study is using a convenience sample of IPED consumers recruited in the Netherlands. Between December 12, 2019, and April 1, 2020, participants were contacted through social media (Facebook, Twitter), the harm reduction agency “Mainline” (
www.mainline.nl), and the most visited Dutch forum for strength sport and bodybuilding (
www.bodybuilding.nl). In addition, participants were recruited by posters and flyers in fitness centers and during the biggest strength sports and bodybuilding event in Belgium and the...