Received: 13 May 2021
Accepted: 28 June 2021
First Online: 10 August 2021
: The Department of Community Medicine at the University of Khartoum, Faculty of Medicine, provided ethical approval (reference number is not available).An informed written consent was obtained electronically from the research participants, stating that no information that could lead to the identification of the questionnaire participants would be obtained, and that all information obtained would be kept secret and secure, and used solely for research purposes.
: Not applicable.
: The authors declare that they have no competing interests.