Authors' contributions
All authors reviewed the final manuscript and approved it. Rehab A Wahdan registered, collected, and analyzed the data and wrote the main manuscript text. Mohamed Metwaly Fathy collected data, helped within the design of the study, and wrote the abstract. Abeer M Elnakera prepared the tables and figures, helped with the study design, and wrote the review and edited the manuscript. Amal Abdul Azeem Salah supervised the study, analyzed the data, and helped with the study design.