1 Swiss Laboratory for Doping Analyses, University Center of Legal Medicine, Lausanne-Geneva, Centre Hospitalier Universitaire Vaudois, University of Lausanne , Chemin des Croisettes 22, 1066 Epalinges, Switzerland.
2 School of Pharmaceutical Sciences, University of Geneva, University of Lausanne , Boulevard d'Yvoy 20, 1211 Geneva 4, Switzerland.