Funding for this research was provided by:
National Natural Science Foundation of China (81671553, 81501359)
Wuxi Science and Technology Development Fund Project (CSE31N1713)
Wuxi Health and Family Planning Committee Youth Project (Q201765)
Text and Data Mining valid from 2019-11-28
Received: 12 May 2019
Accepted: 30 September 2019
First Online: 28 November 2019
Ethics approval and consent to participate
: This study was approved by the Ethics committee of Huashan Hospital, Fudan University. Written informed consent was obtained from all participants.
: Not applicable.
: The authors declare that they have no competing interests.