1. Applied Health Intervention Research, Department of Prevention and Evaluation, Leibniz Institute for Prevention Research and Epidemiology–BIPS, Bremen, Germany.
2. University of Bremen, Health Sciences, Department Public Health, Bremen, Germany.
3. Institute of Public Health, University of Gondar College of Medicine and Health Sciences, Gondar, Ethiopia.
4. Institute of Medical Sociology, Centre for Health and Society, Medical Faculty, Heinrich Heine University Düsseldorf, Düsseldorf, Germany.