1. 1Department of Biomedical and Health Information Sciences, University of Illinois, Chicago, Illinois;
2. 2Teesside University, Middlesbrough, England;
3. 3National Primary Health Care Development Agency (NPHCDA), Abuja, Nigeria;
4. 4Strategy, Investment and Impact Division, Global Fund to Fight AIDS, Tuberculosis and Malaria, Geneva, Switzerland;
5. 5Harvard T.H. Chan School of Public Health, Boston, Massachusetts;
6. 6School of Community Health Sciences, University of Nevada, Reno, Nevada;
7. 7School of Public Health and Family Medicine, University of Cape Town, Cape Town, South Africa;
8. 8Department of Community Medicine, Alex Ekwueme Federal University Teaching Hospital Abakaliki, Nigeria