1. Department of Dermatology, Amsterdam Institute for Infection and Immunity (AI&II), Amsterdam, the Netherlands
2. Department of Clinical Epidemiology, Biostatistics and Bioinformatics, Amsterdam Public Health Research Institute, Amsterdam, the Netherlands
3. Medical Library, University of Amsterdam, Amsterdam UMC, Amsterdam, the Netherlands
4. Department of Internal Medicine, University of Amsterdam, Amsterdam UMC, Amsterdam, the Netherlands
5. STI Outpatient Clinic, Department of Infectious Diseases, Public Health Service of Amsterdam (GGD Amsterdam), Amsterdam, the Netherlands