Received: 1 May 2020
Accepted: 16 June 2020
First Online: 22 June 2020
Ethics approval and consent to participate
: This study protocol was reviewed and approved by the institutional review board of Chang Gung Memorial Hospital (Reference No.: 202000138B0).
: All data were stored in the hospital database and extracted for research. The participants’ informed consent requirement was waived due to the retrospective nature of this study.
: The authors declare that they have no competing interests.