1. College of Medicine and Health Sciences, Bahir Dar University, Bahir Dar, Ethiopia
2. School of Public Health, The University of Queensland, Brisbane, QLD, Australia
3. Department of Immunology, School of Biomedical and Laboratory Sciences, College of Medicine and Health Sciences, University of Gondar, Gondar, Ethiopia
4. School of Public Health, Curtin University, Perth, WA, Australia
5. Department of Epidemiology and Biostatistics, Institute of Public Health, University of Gondar, Gondar, Ethiopia
6. School of Population Health, Australian National University, Canberra, ACT, Australia
7. Department of Epidemiology and Psychiatry, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands
8. Department of Quantitative Economics, School of Business and Economics, Maastricht University, Maastricht, The Netherlands
9. Department of Clinical Research, Faculty of Health Sciences, University of Southern Denmark, Odense, Denmark
10. Faculty of Health, University of Canberra Hospital, Canberra, ACT, Australia