Received: 8 June 2020
Accepted: 10 January 2021
First Online: 20 January 2021
Change Date: 25 February 2021
Change Type: Correction
Change Details: A Correction to this paper has been published:
Change Details: https://doi.org/10.1186/s12887-021-02555-w
Ethics approval and consent to participate
: Institutional Review Board approval was obtained by Essos Hospital Center. The committee’s reference number was not applicable in this study in 2015.Verbal consent was obtained by all parents in this study. We ask parents for their consent before the start of the exam. They accept because they know that we are doing research to improve the exams. For this research, only verbal consent was approved by the ethics committee.
: Not Applicable.
: The authors declare that they have no competing interests.