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Article History

Received: 12 June 2019

Accepted: 19 August 2019

First Online: 26 August 2019

Compliance with ethical standards

:

: The authors have no conflicts of interest to disclose.

: All procedures performed in this study were in accordance with the ethical standards of the institutional research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.

: When possible, due to the retrospective design of the study, parental written informed consent was obtained from parents.