1. Department of Microbiology, Tumor and Cell Biology, Karolinska Institutet, Stockholm, Sweden;
2. Department of Pathology and the Körber Laboratory for AIDS Research, Berhard-Nocht Institute for Tropical Diseases, Hamburg, Germany;
3. Department of Medicine Solna, Infectious Diseases Unit, Karolinska University Hospital, Stockholm, Sweden;
4. Gay Men's Health Clinic, Soder Hospital, Stockholm, Sweden; and
5. Department of Women and Child Health, Karolinska Institutet, Stockholm, Sweden