Funding for this research was provided by:
National Key Research and Development Program of China (No. 2016YFC1306201)
National Key Research and Development Program of China (No. 2016YFC0901505)
Received: 11 October 2018
Accepted: 27 March 2019
First Online: 14 May 2019
Ethics approval and consent to participate
: This study was approved by the Medical Ethics Committee of Peking University First Hospital (No. 004). Written consent was obtained from patients’ parents or guardians.
: Not applicable.
: The authors declare that they have no competing interests.
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