Funding for this research was provided by:
Ministry of Science and Technology, Taiwan (105-2628-B-075-004-MY2)
Received: 1 May 2019
Accepted: 22 September 2019
First Online: 1 November 2019
Ethics approval and consent to participate
: The investigation was approved by the Ethical Committee of Taipei Veterans General Hospital. The study was performed in accordance with the Declaration of Helsinki. Written informed consent was obtained from all study participants.
: Not applicable
: The authors declare that they have no competing interests.