Text and Data Mining valid from 2019-07-10
Received: 26 June 2018
Accepted: 23 June 2019
First Online: 10 July 2019
Ethics approval and consent to participate
: This study was conducted with a waiver of patient consent approved by the Institutional Review Board of Kaohsiung Chang Gung Memorial Hospital (document no. 201800595B0) and conducted according to the Declaration of Helsinki. In keeping with the retrospective data review regulations of the Committee on Human Research of Kaohsiung Chang Gung Memorial Hospital, signed informed consent from the study participants was not required.
: Not applicable.
: The authors declare that they have no competing interests.