1. Department of Epidemiology and Public Health, Swiss Tropical and Public Health Institute (Swiss TPH), Socinstrasse 57, 4051 Basel, Switzerland
2. University of Basel, Petersplatz 1, Basel 4001, Switzerland
3. Department of Business Economics, Health and Social Care, University of Applied Sciences and Arts of Southern Switzerland (SUPSI), Via Violino 11, Manno 6928, Switzerland
4. Centre for Primary Care and Health Services Research, University of Manchester, Oxford Road, Manchester M13 9PL, UK
5. Ifakara Health Institute, Plot 463, Kiko Avenue Mikocheni, Dar es Salaam, Tanzania