Received: 22 November 2019
Accepted: 18 December 2019
First Online: 30 December 2019
Ethics approval and consent to participate
: Ethics approval of the study protocol was approved by the Ethical Committee of the Faculty of Medicine at Benha and Tanta Universities and Atfal Misr Hospital. Committee’s reference number is not applicable. The need for informed consent was waived due to the retrospective nature of the study.
: Not applicable.
: The authors declare that they have no competing interests.