1. Laboratory of Bacteriology, Virology and Hygiene; University Hospitals of Paris Seine-Saint-Denis; Avicenne site
2. French National Reference Laboratory for hepatitis delta virus; associated to the National Reference Center for Viral Hepatitis B, C and Delta in France
3. INSERM U955, Team 18; Institut Mondor de Recherche Biomédicale; Créteil France
4. Institute of Microbiology, Lausanne University Hospital (CHUV); and University of Lausanne; Lausanne Switzerland
5. Biostatistic Department and Medical Informatics; Saint-Louis Hospital, Paris VII University; Paris France
6. Biostatistics Department, and Clinical Epidemiology; Saint-Louis Hospital, Paris VII University; Paris France