Received: 10 June 2020
Accepted: 4 January 2021
First Online: 13 January 2021
Ethics approval and consent to participate
: Since human subjects or personally identifiable records were not used in the current analysis, informed consent was not required. The study protocol was approved by the Ethics Committee of the Institutional Review Board of Kaohsiung Veterans General Hospital (IRB: VGHKS19-CT9-07).
: Not applicable.
: The authors declare that they have no competing interests.