1. Service Universitaire des Maladies Infectieuses et du Voyageur, Centre Hospitalier de Tourcoing, Faculté de Médecine de Lille, France
2. Labores CNRS U362, Lille, France
3. Department of Health Policy and Management and Department of Epidemiology, Harvard School of Public Health, Boston, Mass., USA
4. Department of Epidemiology and Biostatistics, Boston University School of Public Health, Boston University School of Medicine, Boston, Mass., USA
5. Department of Epidemiology and Public Health, Yale University School of Medicine, New Haven, Conn., USA
6. Direction de l'Hospitalisation et de l'Organisation des soins, Ministère d'emploi et de solidarité, Paris, France
7. Division of General Medicine and Partners AIDS Research Center, Department of Medicine, Massachusetts General Hospital, Harvard Medical School, Boston, Mass., USA
8. INSERM Unit 330, University of Bordeaux II, Bordeaux, France