1. a Institute for Educational Research, Faculty of Education , University of Oslo , Norway
2. b GLOBINF, Center for Prevention of Global Infections, Faculty of Medicine , University of Oslo , Norway
3. c Section for International Community Health, Faculty of Medicine , University of Oslo , Norway
4. d Muhimbili University College of Health Sciences , Dar es Salaam , Tanzania
5. e Center for Educational Development in Health , Arusha , Tanzania
6. f Department for Nutrition Research, Faculty of Medicine , University of Oslo , Norway