Text and Data Mining valid from 2019-05-31
Received: 23 July 2018
Accepted: 27 May 2019
First Online: 31 May 2019
Ethics approval and consent to participate
: This study was approved by the Research Ethics Committee of Tianjin Medical University. Written informed consent was obtained from all patients.
: Not applicable.
: The authors declare that they have no conflict of interest.