Funding for this research was provided by:
National Natural Science Foundation of China (81803078, 81672516, 81802480, 81703051)
Changhai Hospital of Shanghai (CH125520400)
Foundation of Shanghai Municipal Commission of Health and Family Planning (2016ZB0303)
Text and Data Mining valid from 2019-07-10
Received: 20 December 2018
Accepted: 28 June 2019
First Online: 10 July 2019
Ethics approval and consent to participate
: Compliance with ethical guidelines.
: Not applicable.
: The authors declare that they have no competing interests.