1. Arud Centre for Addiction Medicine, Zürich, Switzerland
2. Faculty of Medicine, University of Basel, Basel, Switzerland
3. Ifakara Health Institute, Ifakara, Tanzania
4. St. Francis Referral Hospital, Ifakara, Tanzania
5. Department of Human Medicine, University of Zurich, Zurich, Switzerland
6. Clinic for Adults, University Psychiatric Clinics Basel, Basel, Switzerland
7. Swiss Tropical and Public Health Institute, Allschwil, Switzerland
8. Division of Infectious Diseases and Hospital Epidemiology, University Hospital of Basel, Basel, Switzerland