1. Sexual and Reproductive Health, Maternal and Newborn Health Unit, Child and Reproductive Health Group, Liverpool School of Tropical Medicine, Liverpool, UK;
2. Primary Health Care and Health Management Centre (PriHEMAC), Ibadan, Nigeria;
3. Public Health, Faculty of Public Health, College of Medicine, University Of Ibadan, Ibadan, Nigeria;
4. The School of Nursing, Midwifery and Social Work, The University of Manchester, Manchester, UK