Funding for this research was provided by:
Ministry of Science and Technology, Taiwan (NSC100-2314-B075-004)
Kaohsiung Veterans General Hospital (VGHKS 102-012, VGHKS 103-102)
Received: 5 January 2017
Accepted: 22 February 2018
First Online: 27 February 2018
Ethics approval and consent to participate
: This study was approved by the Institutional Review Board of Kaohsiung Veterans General Hospital (VGHKS-CT6–05) and was performed according to the Helsinski Declaration. The protocol was registered in the Government Research Bulletin according to the law of Taiwan. Both written and verbal informed consent was obtained for all participants.
: Not applicable
: The authors declare that they have no competing interests.
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