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Article History

Received: 28 May 2018

Accepted: 4 December 2018

First Online: 8 January 2019

Ethics approval and consent to participate

: The ethics committee of Children’s Hospital of Fudan University approved the study design and protocol, and this approval was adopted by all the participating centers in Huai’an through respective institutional review boards/scientific committees in accordance with the Chinese regulations for clinical investigation. As no specific intervention was involved in the study protocol, informed consent was waived.

: Not applicable.

: All the authors have declared no any financial and non-financial competing interests to disclose.

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