Text and Data Mining valid from 2019-08-13
Received: 12 November 2018
Accepted: 6 August 2019
First Online: 13 August 2019
: The authors declare that they have no competing interests.
: This study was conducted in accordance with the Declaration of Helsinki.This study was conducted with approval from the Ethics Committee of Peking University Shenzhen Hospital. Written informed consent was obtained from all participants.
: Not applicable.