Received: 4 January 2019
Revised: 30 April 2019
Accepted: 13 May 2019
First Online: 3 June 2019
Ethics approval and consent to participate
: The informed consents were obtained from the parents or guardians, and the ethics approval was required according to the guidelines from the Children’s Hospital of Zhejiang University School of Medicine Committee on the Use of Human Subjects in Research. All the procedures described in this report have been approved by the Children’s Hospital of Zhejiang University IRB (approval number: 2013-GJ-003; approval date: February 25, 2013).
: Not applicable.
: The authors declare that they have no competing interests.
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