Funding for this research was provided by:
The Project of Invigorating Health Care through Science, Technology and Education (ZDXKA2016019)
Nanjing National Commission on Health and Family Planning (YKK16183)
Nanjing National Commission on Health and Family Planning (YKK18146)
Nanjing Science and Technology Commission (201823013)
Received: 30 December 2019
Accepted: 28 February 2020
First Online: 11 March 2020
Ethics approval and consent to participate
: The study was approved by the ethical committee of Drum Tower Hospital.Written informed consent was obtained from all patients before enrolment in this study.
: Not applicable.
: The authors declare that they have no competing interests.