Text and Data Mining valid from 2019-11-04
Received: 6 June 2019
Accepted: 24 October 2019
First Online: 4 November 2019
Ethics approval and consent to participate
: Ethical approval was given by the Huashan Hospital Ethics Review Committee, and the committee’s reference number is not applicable. Written consent was obtained from participants or their legally authorized caregivers.
: Not applicable
: The authors declare that they have no competing interests.