1. Infectious Disease Unit, Niger Delta University Teaching Hospital, Okolobiri, Bayelsa, Nigeria
2. Infectious Disease Unit, Federal Medical Centre Owerri/University of Nigeria Teaching Hospital, Enugu, Nigeria
3. Paediatric Infectious Disease Unit, University College Hospital, Ibadan, Oyo State, Nigeria
4. Nigerian Centre for Disease Control, Abuja, Federal Capital Territory, Nigeria
5. Nigerian Prison Services, Port Harcourt, Rivers State, Nigeria
6. Department of Medicine, University of Port Harcourt Teaching Hospital, Port Harcourt, Rivers State, Nigeria
7. Ministry of Health, Nasarawa, Nasarawa State, Nigeria
8. Global Public Health Department, Public Health England, London, United Kingdom