Received: 13 March 2019
Accepted: 27 May 2019
First Online: 30 May 2019
Ethics approval and consent to participate
: The present study was authorized Ethics Committee of Second Hospital of Hebei Medical University and Verbal consent was obtained from each patient. 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.