1. Cochrane South Africa, South African Medical Research Council, Cape Town, South Africa
2. Division of Epidemiology and Biostatistics, Department of Global Health, Faculty of Medicine and Health Sciences, Stellenbosch University, Cape Town, South Africa
3. Department of Community Medicine, Bayero University/Aminu Kano Teaching Hospital, Kano, Nigeria
4. Department of Obstetrics and Gynecology, Aminu Kano Teaching Hospital, Kano, Nigeria
5. Agence de Médecine Préventive, Regional Office for Africa, Abidjan, Cote d’Ivoire
6. Vaccine-Preventable Diseases Programme, World Health Organization Regional Office for Africa, Brazzaville, Congo