Text and Data Mining valid from 2019-07-29
Received: 23 April 2019
Accepted: 22 July 2019
First Online: 29 July 2019
Ethics approval and consent to participate
: The present study was authorized Ethics Committee of Second Hospital of Hebei Medical University. All patients and volunteers were anonymous and provided written informed consent.
: Written consent was obtained from all participants.
: The authors declare that they have no competing interests.