1. CIHLMU Center for International Health, Ludwig-Maximilians-Universität München, Ziemssenstr. 1, D-80336 München, Germany
2. Department of Health Policy and Management, Jimma University, Aba Jifar 1 Street, Jimma 378, Ethiopia
3. School of Public Health, Addis Ababa University, Zambia street, Addis Ababa 11950, Ethiopia
4. Institute for Medical Data Processing, Biometry and Epidemiology, Ludwig-Maximilians Universität München, Marchioninistr. 17, D-81377 München, Germany
5. Division of Infectious Diseases and Tropical Medicine, Medical Centre of the University of Munich (LMU), Leopoldstr. 7, D-80802 München, Germany