[1] Inst Trop Med, HIV STI Epidemiol & Control Unit, Dept Microbiol, B-2000 Antwerp, Belgium
[2] Univ Appl Sci NW Switzerland, Sch Social Work, Olten, Switzerland
[3] Univ Complutense, Dept Psychol, E-28040 Madrid, Spain
[4] Univ Lausanne Hosp, Data Ctr Swiss HIV Cohort Study, Lausanne, Switzerland
[5] Inst Hyg & Trop Med, Lisbon, Portugal
[6] AIDES, Paris, France