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Article History

Received: 19 November 2017

Accepted: 4 June 2018

First Online: 23 June 2018

Ethics approval and consent to participate

: All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards. The protocol was approved by the Institutional Research Board (IRB) of each institution. The IRB numbers of the participating hospitals are as follows: KC13MDMT0120 at Seoul St. Mary’s Hospital; VC13MDMT0024 at St. Vincent’s Hospital; KMC2015–009 at Hanjin General Hospital; DC14MDMT0006 at Daejeon St. Mary’s Hospital; PS13MDMT0015 at St. Paul’s Hospital; OC13MDMT0025 at Incheon St. Mary’s Hospital; and CR115093 at Yonsei Christian Hospital.Written informed consent was obtained from parents or legal guardians and from the child, if possible.

: The authors declare that they have no competing interests.

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