Received: 27 May 2021
Accepted: 15 August 2021
First Online: 8 September 2021
: This study was also approved by the Institutional Review Board of the Kaohsiung Veterans General Hospital (IRB No.: KSVGH18-CT10-07), who supervised the study in accordance with the tenets of the Declaration of Helsinki (1975) and its later amendment (2013). The requirement for patient consent was waived due to retrospective study design and proved by Institutional Review Board of the Kaohsiung Veterans General Hospital.
: Not applicable.
: The authors declare no conflict of interest.