1. Sightsavers , Nigeria, No 1 Golf Course Road 800283 , Nigeria
2. Department of International Public Health, Liverpool School of Tropical Medicine , L3 5QA, Liverpool , UK
3. Lere Local Government No 6 Ungwan Yango Nassarawa Saminaka , Saminaka, Lere, 811104, Kaduna , Nigeria
4. Baruten Local Government No 3 Local Government Secretariat , Kosubosu, 242102, Kwara , Nigeria