Funding for this research was provided by:
Chang Gung Memorial Hospital, Linkou (CMRPG3H0190)
Received: 30 January 2019
Accepted: 10 June 2019
First Online: 19 June 2019
Ethics approval and consent to participate
: This study was approved by the institutional review board of Chang Gung Memorial Hospital, with a waiver of informed consent because all patients records and information were anonymized and de-identified prior to analysis.
: Not applicable.
: The authors declare that they have no competing interests.