1. Department of Paediatrics, University of Maiduguri Teaching Hospital, PMB 1414, Maiduguri, Borno State, Nigeria
2. Amana Specialist Hospital, Tandari-Shokwari Ward, Maiduguri, Borno State, Nigeria
3. Department of Community Medicine, College of Medical Sciences, University of Maiduguri, PMB 1069, Maiduguri, Borno State, Nigeria