University of Bern - Institute of Social and Preventive Medicine, University of Bern - Institute of Social and Preventive Medicine, University of Bern - Institute of Social and Preventive Medicine, University of Basel - Swiss Tropical and Public Health Institute, University of Zurich, Centre de Prise en Charge de Recherche et de Formation, Yopougon, University of Bordeaux, Ohio State University (OSU) - Division of Epidemiology, Moi University, Moi University, University of Cape Town (UCT) - Wellcome Centre for Infectious Disease Research in Africa, University of Cape Town (UCT), University of Cape Town (UCT), - Institute of Human Virology, - Institute of Human Virology, Universidad Peruana Cayetano Heredia, Thai Red Cross AIDS Research Centre, Bangkok, Chulalongkorn University, University of Basel - Swiss Tropical and Public Health Institute, University of Zurich, Government of the United States of America - National Institute of Allergy and Infectious Diseases (NIAID), University of Basel - Swiss Tropical and Public Health Institute, University of Zurich and University of Bern - Institute of Social and Preventive Medicine