1. Division of Infectious Diseases and Hospital Epidemiology, Cantonal Hospital Aarau, Switzerland
2. Arud Centre for Addiction Medicine, Zurich, Switzerland
3. Private Practice, Lausanne, Switzerland
4. Epatocentro Ticino SA, Lugano, Switzerland / Ingrado Servizi per Le Dipendenze, Lugano, Switzerland
5. Private Practice, Basel, Switzerland
6. Department of Infectious Diseases, Bern University Hospital, Switzerland
7. Division of Infectious Diseases and Hospital Epidemiology, Cantonal Hospital St Gallen, Switzerland