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Article History

Received: 5 January 2018

Accepted: 20 February 2019

First Online: 4 March 2019

Ethics approval and consent to participate

: This study was approved by the Institutional Review Board of Tzu Chi Medical Center (REC No.: IRB104-131C). The requirement for participant consent was waived owing to the retrospective nature of this study using de-identified secondary data.

: Not applicable.

: The authors declare that they have no competing interests.

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