Text and Data Mining valid from 2020-01-06
Received: 1 August 2019
Accepted: 12 December 2019
First Online: 6 January 2020
Ethics approval and consent to participate
: This study was approved by the ethical committee of Addis Continental Institute of Public Health. Written and verbal informed consent from the study participants was also obtained before conducting this study.
: Not applicable.
: The authors have declared that no competing interests exist.