Article History
Received: 2 March 2021
Revised: 18 March 2021
Accepted: 29 March 2021
First Online: 4 April 2021
Declarations
:
: The local ethics committee of Faculty of Medicine, Tanta University, approved the study. The study is in accordance with the ethical standards of institutional research committee and with the 1964 Helsinki declaration and its later amendments.
: An informed consent was obtained from the parents of all subjects of the study before enrollment.
: All the authors transfer, assign, or otherwise convey all copyright ownership, including any and all rights exclusively to the journal, in the event that such work is published by the journal.
: The authors declare no competing interests.