Funding for this research was provided by:
National Natural Science Foundation of China (31571212)
Text and Data Mining valid from 2019-12-01
Received: 12 February 2019
Accepted: 11 November 2019
First Online: 3 December 2019
Ethics approval and consent to participate
: This study was conducted according to the World Medical Association Declaration of Helsinki and approved by the Ethics Committee of Shanghai Jiao Tong University Affiliated Sixth People’s Hospital. All subjects provided written informed consent before the interview.
: Not applicable.
: The authors declare that they have no competing interests.