Funding for this research was provided by:
National Natural Science Foundation of China (81874265, 81803244, 81530086, 81703238)
Science and Technology Commission of Shanghai Municipality (18411966600)
Text and Data Mining valid from 2019-05-02
Received: 26 January 2019
Accepted: 22 April 2019
First Online: 2 May 2019
Ethics approval and consent to participate
: Ethics approval was obtained by the Ethics Committees of both two hospitals, and all participants provided informed consent. The ethics approval was separately obtained from the Institutional Review Broad of Xin Hua Hospital and International Peace Maternity and Infant Health affiliated to the Shanghai Jiao Tong University School of Medicine. A written consent was obtained prior enter into the study from each participant. And parental consent has been obtained from the participants age 16 years below.
: Not applicable.
: The authors declare that they have no competing interests.
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