Received: 12 November 2019
Accepted: 22 January 2020
First Online: 3 February 2020
Ethics approval and consent to participate
: The study was conducted after ethical approval was obtained from the Institute for Advanced Medical Research and Training (IAMRAT), College of Medicine, University of Ibadan, Ibadan, Nigeria with the I/UCH EC Registration Number of NHREC/05/01/2008a and UI/UCH Ethics Committee assigned number of UI/EC/17/0435 and the Institutional Review Board (IRB) of the University of Gondar (Ref.No; O/V/P/RCS/05/811/2018). Permission from the Amhara Public Health Institute and the health authorities of the study sites was also received prior to the start of the study. All participants provided (written or thumb-printed) informed consent. The collected information during the course of the research was treated with the utmost confidentiality.
: Not applicable
: The authors declared that they have no competing interests.