Received: 22 May 2019
Accepted: 7 February 2021
First Online: 17 February 2021
Ethics approval and consent to participate
: This study was ethically approved by the Ethics Committee for Research involving Human Subjects of University Putra Malaysia (JKEUPM), on 06/02/2015, ref.: UPM/TNCPI/RMC/18.104.22.168 (JKEUPM). As there was no local ethics committee, the Ministry of Public Health and Population in Yemen took responsibility as the committee; hence it approved the ethical requirement from the ethical committee of the Putra University Malaysia. Permission from all involved public hospitals was obtained before data collection. The respondents’ information sheet was also provided for all eligible participants, and written consent was received before conducting the study.
: Not applicable.
: No conflict of interests is declared.