Funding for this research was provided by:
Norges Forskningsråd (220554)
Received: 22 August 2018
Accepted: 15 May 2019
First Online: 24 May 2019
Ethics approval and consent to participate
: Ethical approval was obtained from the Institutional Review Board of the College of Health Sciences at Addis Ababa University, the Ministry of Science and Technology in Ethiopia (Ref: 3.10/446/06), and the Regional Committee for Medical and Health Research Ethics, (Ref: 2013/986/REK Vest) Western Norway.
: Not applicable.
: The authors have declared that they have no competing interests.