Funding for this research was provided by:
Tri-Service General Hospital (TSGH-C108-003, TSGH-B-109010)
Received: 13 November 2019
Accepted: 6 February 2020
First Online: 11 February 2020
Ethics approval and consent to participate
: This study was conducted following the Code of Ethics of the World Medical Association (Declaration of Helsinki). The Institutional Review Board of Tri-Service General Hospital approved this study and waived the need for individual written informed consent because all participants’ ID was removed or properly concealed (TSGH IRB No.2–105–05-082).
: Not applicable.
: The authors declare that they have no competing interests.