Article History
Received: 21 December 2018
Revised: 1 October 2019
Accepted: 4 October 2019
First Online: 13 February 2020
Compliance with Ethical Standards
:
: The authors declare that they have no conflict of interest.
: All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards. Ethical approval was obtained from the Directorate of Research, Ministry of Health, Khartoum State, in July 2014.
: Informed consent was obtained from all individual participants included in the study.