Ethics approval and consent to participate
NHREC/01/01/2007
Ethical approval for the study was obtained from the World Health Organization and the National Health Research Ethics Committee (NHREC) of Nigeria with registration number NHREC/01/01/2007 (16/07/2014), renewed in 2015 with registration number NHREC 01/01/20047b (12/12/2015). The Chief Medical Directors, and Heads of Departments in the hospitals were informed of the purpose of the study, and verbal consent was obtained from them to conduct the study. Verbal informed consent was obtained from the participants. The consent procedure was approved by the Nigeria NHREC as a part of the ethical approval. They were assured of the confidentiality of the information obtained. No names or specific contact information were obtained from the study participants. The research methods were performed in accordance with the Declaration of Helsinki on research involving human participants.