1. Center for Disease Analysis, Lafayette, CO, USA
2. University of Ghent Hospital, Internal Medicine, Ghent, Belgium
3. Infectious Diseases, St Pierre University Hospital, Brussels, Belgium
4. Infectious Diseases, Erasme Hospital, Brussels, Belgium
5. Infectious Diseases, University of Liege – Sart Tilman, Liege, Belgium
6. Hospital Infectious Diseases, University of Ghent, Ghent, Belgium
7. St Pierre University Hospital, Clinical Research Unit, Brussels, Belgium
8. Erasme Hospital, Immunodeficiency Unit/AIDS Reference Center, Brussels, Belgium