Published on in Vol 6, No 1 (2017): January
1 Department of Clinical Sciences, Institute of Tropical Medicine, Antwerp, Belgium
2 HIV and Sexual Health Unit, Department of Public Health, Institute of Tropical Medicine, Antwerp, Belgium
3 HIV/Sexually Transmitted Infection Clinic, Department of Clinical Sciences, Institute of Tropical Medicine, Antwerp, Belgium
4 Department of Medicine, University of Cape Town, Cape Town, South Africa
5 See Authors' Contributions section for collaborators/group members, Antwerp, Belgium
*these authors contributed equally