1. Independent Consultant, LGJ Consultants, Inc, Valencia, Spain
2. Department of Statistics, Oregon State University, Corvallis, OR, USA
3. Infectious Diseases Section, Department of Diagnostics and Public Health, University of Verona, Verona, Italy
4. NRC for HIV/AIDS Prevention, Slovak Medical University, Bratislava, Slovakia
5. Department of Sexual and Reproductive Health and Research, SRH, World Health Organization, Geneva, Switzerland
6. Faculty of Medicine and Health Sciences, Ghent University, Gent, Belgium
7. School of Health Sciences, University of Brighton, Brighton, UK