Received: 26 November 2018
Accepted: 6 February 2020
First Online: 11 February 2020
Ethics approval and consent to participate
: Ethical clearance was obtained from an institutional ethical review committee of Institute of Public Health, college of Medicine and Health Science, University of Gondar, Ethiopia (<b>Ref No /IPH/268/2017</b>). Permission for data access was obtained from the Major DHS program after registering as an authorized user. All the data used in this manuscript are publicly available and confidentiality was maintained anonymously.
: Not applicable.
: The authors declare that they have no competing interests.