Text and Data Mining valid from 2019-12-01
Received: 24 June 2019
Accepted: 11 December 2019
First Online: 21 December 2019
Ethics approval and consent to participate
: This study was approved by the ethics committee of Peking University People’s Hospital, China. Written informed consent was obtained from all participants.
: Not applicable.
: The authors declare that they have no competing interests.