Received: 12 November 2019
Accepted: 11 May 2020
First Online: 16 June 2020
Ethics approval consent to participate
: This study was approved by the medical ethics committee of Binzhou medical university affiliated Yantai hospital. All of the enrolled patients had written informed consent before participating this study.
: All of the collected patients had written informed consent before participate in this study, and the consent of publication was obtained from patients.
: The authors declare that they have no competing interests.