Ethical approval
The study protocol (IPH/OAU/12/229) was approved by the Ethical Committee of the Institute of Public Health of the Obafemi Awolowo University in Nigeria. Prior to respondents’ verbal consent, they were informed about the purpose of the study and were made to understand that participation was voluntary and refusal to participate in the study attracts no penalty. The study respondents were assured of confidentiality and personal identifiers were removed in the summary data to ensure confidentiality. Though the questionnaires were distributed to randomly selected respondents in the 26 wards, it bears only codes and administered at various times and shift work duties to guarantee confidentiality. In addition, only the research team members had access to electronic data, encrypted and stored only in the external hard drive of the principal investigator. Besides, the data collection was anonymous and participants in the FGDs were randomly picked and borne identification codes only.