Text and Data Mining valid from 2020-01-10
Received: 7 August 2019
Accepted: 31 December 2019
First Online: 10 January 2020
Ethics approval and consent to participate
: This study was approved by the Ethics Committee of the Second Hospital of Hebei Medical University.Written informed consent for participate was obtained from the patient.
: Written informed consent for publication was obtained from the patient.
: The authors declare that they have no conflict of interest.