Received: 24 July 2019
Accepted: 2 December 2019
First Online: 16 December 2019
Ethics approval and consent to participate
: The name of the ethics committee: Ethics Committee of First Affiliated Hospital of Dalian Medical University.Ethics References No: YJ-KY-FB-2018-59.
: We simply extracted data and did not involve the private information of patients.
: The authors declare that they have no competing interests.