Received: 14 May 2021
Accepted: 12 July 2021
First Online: 11 August 2021
: This study was approved by the Ethics Committee of Children Cancer Hospital 57357 Cairo Egypt (Scientific Meeting Association Committee) with approval number [SMAC 147/2020] and approval date 22/07/2020 Informed written consent was taken from all subjects.
: Not applicable.
: No financial or non-financial competing interests.