Funding for this research was provided by:
National Natural Science Foundation of China (81801752)
Shanghai Sailing Program (19YF1405300, 18YF1403200)
startup fund of Huashan Hospital, Fudan University (837, 2017QD081)
program of the Shanghai Science and Technology Commission (17411953500)
Key project of the Tianjin Health and Family Planning Commission (2015KR01)
Text and Data Mining valid from 2019-11-13
Received: 10 May 2019
Accepted: 5 November 2019
First Online: 13 November 2019
Compliance with ethical standards
: All authors declare no conflict of interest regarding the present study. This study was sponsored by the Shanghai Sailing Program (19YF1405300), startup fund of Huashan Hospital, Fudan University (837) to QH; the National Science Foundation of China (81801752), Shanghai Sailing Program (18YF1403200) and startup fund of Huashan Hospital, Fudan University (2017QD081) to XF; Science and Technology Commission of Shanghai Municipality (Grant number 17411953500) to YG; and Key project of the Tianjin Health and Family Planning Commission (2015KR01) to DS.
: All the participants or their guardians provided informed consent prior to their inclusion in the study. This study and was approved by the institutional review boards of Huashan hospital, Fudan University, and was conducted following Declaration of Helsinki guidelines.