Received: 1 April 2019
Accepted: 9 October 2019
First Online: 19 November 2019
Ethics approval and consent to participate
: The ethical principles were adhered to, and ethical approvals to conduct the study were duly obtained from the Ethical Committee of the Ministry of Health, Khartoum State, Khartoum Teaching Dental Hospital, number: [WK/OS/AETEA/44/1].
: All authors read and approved the final manuscript and consent to the publication.
: Motaz Osman, Hassan Ziada, Ahmed Suliman, and Neamat Abubakr Hassan declare that they have no competing interests.