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Material preparation, data collection and analysis were done by Mahmoud MA; protocol development and topic selection by Ahmed A; statistical monitoring\/analyses by Khaled A and Ramy ME; manuscript reconstruction, language improvement and statistical monitoring\/analyses by Fawzy E. The first draft of the manuscript was written by Fawzy Elbarbry and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript. All authors agreed on the following statements: (1) made substantial contributions to the conception or design of the work; or the acquisition, analysis, or interpretation of data; (2) drafted the work or revised it critically for important intellectual content; (3) approved the version to be published; and (4) agree to be accountable for all aspects of the work in ensuring that questions related to the accuracy or integrity of any part of the work are appropriately investigated and resolved.","order":8,"name":"Ethics","group":{"name":"EthicsHeading","label":"Author Contributions"}}]}}