Zhai, Jia
Zou, Yingxue
Liu, Jie
Jin, Xingnan
Ma, Cuian
Li, Jiao
Guo, Run
Huang, Bing
Funding for this research was provided by:
key discipline project of Tianjin health and family planning commission (13KG125)
Article History
Received: 15 August 2018
Accepted: 3 January 2019
First Online: 29 January 2019
Ethics approval and consent to participate
: The study protocol was approved by the Ethic Committee of the Tianjin Children’s Hospital and conducted in accordance with Helsinki’s Declaration. Consent to participate from the under 16 years old was given by a legal guardian.
: Not applicable.
: The authors declare that they have no competing interest.
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