Received: 16 January 2020
Accepted: 3 June 2020
First Online: 29 June 2020
Ethics approval and consent to participate
: This is a retrospective review and is neither prospective nor experimental. A research ethical approval was not applicable; however, approval for the data collection and analysis for the purpose of the study was obtained from the research and scientific committee of the Surgical Oncology Unit and Pediatric Surgery Department at Tanta University, and Pediatric Surgery Department at Alexandria University in January 2019.
: Informed consents were signed by all parents for surgery and data use in scientific purposes only at the time of management at Tanta University and Alexandria University. This consent was clearly stated in the manuscript in the “Methods” section. All the private data of patients such as name, address, and phone number or even identity photos will not appear in the research. The consents are in the patients’ medical records.
: The authors declare that they have no competing interests.