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This article has been revised to update the affiliation for Lateefa Aldakhil. The previous affiliation was:
Department of Obstetrics and Gynaecology, King Saud University Medical City, Riyadh, SAU
This has been clarified as:
Department of Obstetrics and Gynecology, College of Medicine, King Saud University, Riyadh, Saudi Arabia
No competing interests declared.
