Received: 9 May 2019
Accepted: 19 January 2020
First Online: 28 January 2020
Ethics approval and consent to participate
: Before undergoing any procedures, all parents of the patients who were included in the present study signed an informed consent form approved by the research ethics committee at the Shahid Beheshti Medical University (SBMU). We have obtained ethical approval, according to ethical standards of the local committee of the Shahid Beheshti Medical University (SBMU)‘s ethics board and with the Declaration of Helsinki. The ethical approval number: IR.SBMU.RETECH.REC.1395.158.
: Not applicable.
: The authors declare that they have no competing interests.