1. College of Medicine and Health Sciences, Bahir Dar University, Bahir Dar, Ethiopia
2. School of Public Health, The University of Queensland, Brisbane, Australia
3. Department of Immunology, School of Biomedical and Laboratory Sciences, College of Medicine and Health Sciences, University of Gondar, Gondar, Ethiopia
4. Department of Public Health, University of Groningen, Groningen, The Netherlands
5. Department of Clinical Chemistry, School of Biomedical and Laboratory Sciences, College of Medicine and Health Sciences, University of Gondar, Gondar, Ethiopia
6. Student clinic, Medical Microbiology, Bahir Dar University, Ethiopia
7. Department of Epidemiology, University Medical Centre Groningen, University of Groningen, Groningen, The Netherlands
8. Department of Quantitative Economics, School of Business and Economics, Maastricht University, Maastricht, The Netherlands