1. Department of Internal Medicine and Infectious Diseases, Erasmus MC, Rotterdam, the Netherlands
2. Department of Viroscience, Erasmus MC, Rotterdam, the Netherlands
3. McGill University AIDS Centre, Lady Davis Institute for Medical Research, Jewish General Hospital, Montreal, Canada
4. Department of Microbiology and Immunology, Faculty of Medicine, McGill University, Montreal, Canada
5. Division of Virology, Department of Medical Microbiology, University Medical Center Utrecht, Utrecht, the Netherlands