Declarations:
Conflict of Interest: The authors declare that they have no conflict of interest.
Authors’ contributions : Dr. Omar Saleh: Has designed the study methodology, did the statistical analysis and participated in article writing. Prof. Fathy Maklady Supervised designing the study, implementing governmental approvals for data collection, supervised data analysis and revised the article writing. Dr. Ahmed Fareed, designed the working protocol, did the data collection and data analysis and wrote the article. All authors read and approved the final manuscript.