1. Department of Public Health Sciences, Karolinska Institutet, Sweden
2. Sigma Research, Department of Social & Environmental Health Research, London School of Hygiene & Tropical Medicine, United Kingdom
3. European Centre for Disease Prevention and Control (ECDC), Stockholm, Sweden
4. Fundació Sida i Societat, Barcelona, Spain
5. Department of Epidemiology, Johns Hopkins Bloomberg School of Public Health, Baltimore, USA