Received: 10 May 2019
Accepted: 28 October 2019
First Online: 11 November 2019
Ethics approval and consent to participate
: This study was performed with the permission of the institutional review board (IRB) of Changhua Christian Hospital in Taiwan. Since this is a retrospective chart review study; therefore, there was no need to obtain informed consent from patients (waiver of documentation of informed consent, IRB permission code: 160612). All review work was performed by ED physicians using a standardized abstraction form (all members were certified their qualifications by IRB). The quality of the review was monitored by regular meetings, and the final output data were de-identified (secondary data).
: Not applicable.
: The authors declare that they have no competing interests.