1. University of Calabar Teaching Hospital; Department of Paediatrics; PMB 1115 Calabar Cross River State Nigeria
2. Liverpool School of Tropical Medicine; International Health Group; Pembroke Place Liverpool Merseyside UK L3 5QA
3. University of Calabar Teaching Hospital; Effective Health Care Research Programme - Nigeria; Calabar Nigeria 540271
4. University of Calabar Teaching Hospital; Institute of Tropical Disease Research and Prevention; Calabar Cross River Nigeria G.P.O 1241