@article{BrandHeckZiegler2014,
  author    = {Ralf Brand and Philipp Heck and Matthias Ziegler},
  title     = {Illegal performance enhancing drugs and doping in sport: a picture-based},
  journal   = {Substance abuse treatment, prevention, and policy},
  volume    = {9},
  doi       = {10.1186/1747-597X-9-7},
  year      = {2014},
}