Funding for this research was provided by:
Chang Gung Memorial Hospital, Linkou (CMRPG8C0571, CMRPG8D0771)
National Science Council (104-2314-B-182A-026-MY2)
Received: 28 April 2017
Accepted: 16 January 2018
First Online: 8 February 2018
Ethics approval and consent to participate
: The study received approval from regional ethical committees at the Chang Gung Memorial Hospital and was carried out in accordance with the tenets of the Helsinki declaration. Written informed consent was obtained from all participants.
: Not applicable.
: The authors declare that they have no competing interests.
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