Funding for this research was provided by:
National Cheng Kung University Hospital
Received: 5 April 2019
Accepted: 5 September 2019
First Online: 12 October 2019
Ethics approval and consent to participate
: The Institutional review board of National Cheng Kung University Hospital approved this study (B-EX-108-012). Informed consent was not required because the datasets were devoid of personally identifiable information.
: Not applicable.
: The authors declare that they have no competing interests.