Text and Data Mining valid from 2019-03-25
Received: 28 December 2018
Accepted: 19 March 2019
First Online: 25 March 2019
Ethics approval and consent to participate
: This study was approved by the Ethics Committee of Kaohsiung Chang Gung Memorial Hospital (IRB No:1608300002). The need for informed consent of all the enrolled subjects was waived due to the retrospective nature of this study.
: Not applicable.
: The authors declare that they have no competing interests.
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