Received: 3 September 2019
Accepted: 26 April 2020
First Online: 11 May 2020
Ethics approval and consent to participate
: This study have been reviewed and approved by the Institutional Review Board of the Ditmanson Medical Foundation Chia-Yi Christian Hospital, Taiwan (CYCH-IRB No: 2018078). Because this was a secondary data analysis, all identifications of patients and institutions in NHIRD have been removed before data release, the informed consent was not applicable.
: Not applicable.
: The authors declare that they have no competing interests.