Text and Data Mining valid from 2019-11-12
Received: 9 July 2019
Accepted: 28 October 2019
First Online: 12 November 2019
Ethics approval and consent to participate
: All subjects gave their informed consent prior to their inclusion in the study. This study was approved by the Research Ethics Committee of the Xiangya Hospital.
: Not applicable.
: The authors declare that they have no competing interests.