Funding for this research was provided by:
Chang Gung Memorial Hospital (CMRPG6E0171 and CORPG6D0161)
Received: 2 January 2018
Accepted: 17 December 2018
First Online: 9 January 2019
Ethics approval and consent to participate
: This study was approved by the institutional review board ethical committee (Chang-Gung Memorial Hospital Ethics Committee No 103-6244B).
: Not applicable.
: The authors declare they have no competing interests.
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