Authors’ contributions
Shereen A. Baioumy, Shereen Mahmoud Ibrahim, Aya Elgendy and Shaimaa Fouad designed the study. Shereen A. Baioumy and Shaimaa Fouad Fouad shared in sample collection. Shereen Mahmoud Ibrahim and Aya Elgendy shared in sample collection and did the statistical analysis. Shaimaa Hani Fouad wrote the draft. Shereen A. Baioumy and Aya Elgendy performed the critical review of the manuscript. All authors reviewed and approved the final version. All authors read and approved the final manuscript.