Text and Data Mining valid from 2019-11-09
Received: 9 October 2019
Accepted: 10 October 2019
First Online: 9 November 2019
Ethics approval and consent to participate
: This study was approved by The Second Hospital of Jilin University and Yanbian University. Informed written consent was obtained from all participants and their relatives.
: Not applicable.
: The authors declare that they have no competing interests.