Gotthardt, Frank
Huber, Christine
Thierfelder, Clara
Grize, Leticia
Kraenzlin, Marius
Scheidegger, Claude
Meier, Christian
Funding for this research was provided by:
Freiwillige Akademische Gesellschaft Basel (Switzerland)
Verein für Drogenarbeit Basel (Switzerland)
Roche Pharma (Switzerland)