Text and Data Mining valid from 2019-08-24
Received: 15 May 2019
Accepted: 16 August 2019
First Online: 24 August 2019
Ethics approval and consent to participate
: This present study was approved by the Ethics Committee of the Affiliated Hospital of Qingdao University.
: We have consent for publication from the patient.
: The authors declare that they have no competing interests.