Article History
Received: 28 February 2018
Accepted: 29 May 2018
First Online: 11 June 2018
Compliance with ethical standards
:
: This study was funded in part by grants from the Taipei Veterans General Hospital (V107C-023) and the Taiwan Ministry of Science and Technology (106-2314-B-075-011).
: The authors declare that they have no conflict of interest.
: All procedures performed in the studies involving human participants were in accordance with the ethical standards of the Taipei Veterans General Hospital Institutional Review Board and with the 1964 Helsinki Declaration and its later amendments or comparable ethical standards.
: Informed consent was obtained from all individual participants included in the study.