University of Bern - Institute of Social and Preventive Medicine, University of Bern - Institute of Social and Preventive Medicine, University of Cape Town (UCT) - Centre for Infectious Disease Epidemiology & Research, University of Bern - Institute of Social and Preventive Medicine, University of Bern - Institute of Social and Preventive Medicine, Lighthouse Trust, University of Bern - Institute of Social and Preventive Medicine, Ministry of Health (Malawi) - HIV/AIDS Unit, University of Bern - Institute of Social and Preventive Medicine, University of Cape Town (UCT) - Centre for Infectious Disease Epidemiology and Research, School of Public Health, University of Bern - Institute of Social and Preventive Medicine, University of the Witwatersrand - epartment of Paediatrics and Child Health, University of Bern - Institute of Social and Preventive Medicine, University of Bern - Institute of Social and Preventive Medicine, Western Cape Government - Health Intelligence and University of Bern - Institute of Social and Preventive Medicine