1 Centre for Epidemiological Studies on Sexually Transmitted Infections and AIDS of Catalonia, Ministry of Health of the Governmen of Catalonia, Badalona, Spain.
2 Doctorate Program in Methodology of Biomedical Research and Public Health, Department of Pediatrics, Obstetrics and Gynecology and Preventive Medicine, Universitat Autònoma de Barcelona (UAB), Badalona, Spain.
3 Germans Trias i Pujol Research Institute, Campus Can Ruti, Badalona, Spain.
5 Biomedical Research Center Network for Epidemiology and Public Health (CIBERESP), Instituto de Salud Carlos III, Madrid, Spain.
6 Stop, Barcelona, Spain.
7 Gais Positius, Barcelona, Spain.
8 Grupo de Trabajo sobre Tratamientos del VIH (gTt-VIH), Barcelona, Spain.
9 Epidemiology Service, Public Health Agency of Barcelona (ASPB), Barcelona, Spain.
10 Department of Genetics and Microbiology, Autonomous University of Barcelona, Badalona, Spain.
11 Programa de prevenció, control i atenció al virus d'immunodeficiència humana, les infeccions de transmissió sexual i les hepatitis víriques, Public Health Agency of Catalonia, Barcelona, Spain.