Tom Decroo1, Nathan Ford2, Marie Laga3. 1. Médecins Sans Frontières Brussels, Brussels, Belgium; Department of Public Health, Institute of Tropical Medicine, 2000 Antwerp, Belgium. 2. HIV/AIDS Department, World Health Organization, Geneva, Switzerland. 3. Department of Public Health, Institute of Tropical Medicine, 2000 Antwerp, Belgium. Electronic address: MLaga@itg.be.