Received: 13 July 2021
Accepted: 14 October 2021
First Online: 6 December 2021
: The study was approved by the ethics committee of the Faculty of Medicine, Assiut University (IRB no: 17101475). Written informed consents were taken from parents with explanation of benefits of the study, risks expected, and suggested treatment for each case.
: Not applicable.
: The authors declare that they have no competing interests.