Received: 10 November 2017
Accepted: 22 December 2019
First Online: 30 December 2019
Ethics approval and consent to participate
: The study protocol was approved by the Thamar University Medical Ethics Committee, Dhamar, Yemen. Written consent could not be obtained from this community due to gender-sensitive issues. Therefore, informed verbal consent was taken from each participant and this procedure was approved by the Medical Ethics Committee.
: Not applicable.
: The authors declare that they have no competing interests.