Received: 19 October 2019
Accepted: 23 June 2020
First Online: 30 June 2020
Ethics approval and consent to participate
: The study design was approved by the ethics committee of Tehran University of Medical Sciences and Ludwig Maximilian University of Munich. The Ethics committee approval number from Tehran University of Medical Sciences is IR.TUMS.VCR.REC.1395.1055 for the research project number 32345. The Ethics committee approval number from Ludwig Maximilian University of Munich is 66–14. Written informed consent was obtained from the patients’ parents.
: patients’ parents gave a written consent for publication.
: The authors declare that they have no competing interests.