Funding for this research was provided by:
Jiangsu Provincial Commission of Health and Family Planning (H2017073)
Jiangsu Province Association of Maternal and Child Health Project (FYX201603)
Jiangsu Maternal and Children health care key discipline (FXK201748)
Jiangsu Maternal and Children health care research project (F201603)
Jiangsu Provincial Medical Innovation Team (CXTDB2017013)
Suzhou Key Medical Center (SZZX201505)
Suzhou Introduced Project of Clinical Medical Expert Team (SZYJTD201708)
Suzhou Industry Technology Innovation Project (SYS201770, SS201873)
Ningbo Health Branding Subject Fund (PPXK2018-06)
Text and Data Mining valid from 2019-09-02
Received: 27 April 2019
Accepted: 23 August 2019
First Online: 2 September 2019
Ethics approval and consent to participate
: The study was approved by the institutional ethics committee of the Affiliated Suzhou Hospital of Nanjing Medical University. Written informed consent were obtained.
: Not applicable.
: The authors declare that they have no competing interests.