Received: 4 February 2020
Accepted: 5 March 2020
First Online: 11 March 2020
Ethics approval and consent to participate
: The study received ethical clearance from the Department of Obstetrics and Gynecology, Faculty of Medicine, University of Khartoum, Sudan (2017/07), in accordance with the Declaration of Helsinki. Each woman signed an informed consent form before to be enrolled in the study.
: Not applicable.
: The corresponding author (IA) is one of the associate editors of the journal.