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Authors
Fadhel, Fahmi Hassan https://orcid.org/0000-0002-4497-7628
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Article History
Received: 14 August 2020
Accepted: 27 October 2020
First Online: 23 November 2020
Ethics approval and consent to participate
: The study was conducted following the principles of the Declaration of Helsinki. Study materials and procedures were approved by the Aden University in Yemen (Ref 201/3/311) and King Khalid University in Saudi Arabia (Number 28423). All participants gave informed written consent. Students were informed that participation was completely voluntary and that the answer to the questionnaire was considered written express consent.
: Not applicable
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