Funding for this research was provided by:
Taipei Veterans General Hospital (V107C-208 and V107C-169)
Received: 15 April 2019
Accepted: 26 February 2020
First Online: 4 March 2020
Ethics approval and consent to participate
: This study was approved by the Institution Review Board of Taipei Veterans General Hospital. The informed consent was waived in this study; however, the data used was anonymised before its use.
: Not applicable.
: The authors declare that they have no competing interests.