About the Authors

Nega Assefa

negaassefa@yahoo.com

Affiliation College of Health Science, Haramaya University, Harar, Ethiopia

Yemane Berhane

Affiliation Addis Continental Institute of Public Health, Addis Ababa, Ethiopia

Alemayehu Worku

Affiliations Addis Continental Institute of Public Health, Addis Ababa, Ethiopia, School of Public Health, Addis Ababa University, Addis Ababa, Ethiopia

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: NA YB AW. Performed the experiments: NA YB AW. Analyzed the data: NA YB AW. Contributed reagents/materials/analysis tools: NA YB AW. Wrote the paper: NA YB AW.