Funding for this research was provided by:
Mekelle University (CRPO/CHS/SM/008/09)
Received: 30 April 2019
Accepted: 5 June 2019
First Online: 13 June 2019
Ethics approval and consent to participate
: The study was ethically approved by the ethical review committee of Mekelle University College of Health Sciences.
: Not applicable.
: The authors declare that they have no competing interests.