1. Department of Biomedical Sciences, Faculty of Sciences, University of Dschang, Dschang, Cameroon
2. Department of Epidemiology and Public Health, Swiss Tropical and Public Health Institute, Basel, Switzerland
3. Division of Health Operations Research, Ministry of Public Health, Nonthaburi, Cameroon
4. Institute of Social and Preventive Medicine, Faculty of Medicine, University of Geneva, Geneva, Switzerland
5. Faculty of Medicine, University of Yaounde 1, Yaounde, Cameroon
6. Department of Research and Training, M.A. SANTE (Meileur Accès aux soins de santé), Yaounde, Cameroon
7. Department of Ambulatory Care and Community Medicine–Infectious Disease Service, University Hospital, Lausanne, Switzerland