Received: 20 January 2021
Accepted: 30 March 2021
First Online: 16 April 2021
Change Date: 24 August 2021
Change Type: Correction
Change Details: A Correction to this paper has been published:
Change Details: https://doi.org/10.1186/S43055-021-00589-9
: This study was performed in line with the principles of the Declaration of Helsinki. Approval was granted by the Ethics Committee of faculty of medicine, Assiut University, Egypt, with IRB number 17300342. Informed consent was waived due to the retrospective nature of the study.
: No separate individual consent was obtained from patients<sup>,</sup> parents for this study as it was retrospective in nature, and the examinations were carried out as part of routine clinical care. No patient-identifying information is included in the manuscript material.
: The authors declare that they have no competing interest.