Funding for this research was provided by:
Ministry of Education, Aim for the Top University Plan and National Yang-Ming University (NA)
Received: 28 December 2018
Accepted: 21 May 2019
First Online: 31 May 2019
Ethics approval and consent to participate
: The study has been approved by the Institutional Research Board at Taipei Veterans General Hospital. Written informed consent was obtained from all participants included in the study (2013–01-026B).
: Not applicable.
: The authors declare that they have no competing interests.