Received: 14 March 2020
Accepted: 24 July 2020
First Online: 30 July 2020
Ethics approval and consent to participate
: The ethical clearance number 5/2018 for this study was obtained from the Ethics Committee, Ministry of Health, Kassala State, Sudan. All participants were provided with a written consent for the purpose of this study. The study objectives were explained to all participants before obtaining the informed consent.
: Not applicable.
: The authors declare that they have no competing interests. The result of this study does not reflect the opinion of the funding sources. All authors have read and approved the final version of this manuscript.