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History
- August 1, 2018.
Copyright
The copyright holder for this preprint is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. It is made available under a CC-BY 4.0 International license.
Author Information
- 1School of Public Health, Addis Ababa University, Addis Ababa, Ethiopia; Tel: +251911361607; E-mail: teferiabegaz{at}gmail.com
- 2School of Public Health, Hawassa University, Hawassa, Ethiopia; Tel: +251916822815; Email: samsongmgs{at}yahoo.com
- ↵*Corresponding author