Funding for this research was provided by:
Ministry of Science and Technology, Taiwan (MOST 105-2628-B-010-015-MY3)
Taipei Veterans General Hospital (V107A-006, V108C-026)
Received: 22 August 2019
Accepted: 2 December 2019
First Online: 3 January 2020
Ethics approval and consent to participate
: The study protocol was approved by the Institutional Review Board of Taipei Veterans General Hospital (protocol number 2017–07-007 AC). No written informed consent was acquired due to the retrospective nature of the study.
: Not applicable.
: The authors declare that they have no competing interests.