1. College of Medicine and Allied Health Sciences, University of Sierra Leone, Freetown 00232, Sierra Leone
2. Ministry of Health and Sanitation, Government of Sierra Leone, Freetown 00232, Sierra Leone
3. US Center for Disease Control and Prevention, Freetown 00232, Sierra Leone
4. World Health Organization Country Office in Sierra Leone, Freetown 00232, Sierra Leone
5. Republic of Sierra Leone Armed Forces, Government of Sierra Leone, Freetown 00232, Sierra Leone
6. Department of Medicine, University of Ibadan, Ibadan 200005, Nigeria
7. Department of Medicine, University College Hospital, Ibadan 200005, Nigeria
8. Independent Researcher, 5000 Namur, Belgium
9. Division of Health Systems Research, ICMR-National Institute of Epidemiology (ICMR-NIE), Chennai 600077, India