Funding for this research was provided by:
Taipei Veterans General Hospital (V107D37-002-MY3-1)
Ministry of Science and Technology, Taiwan (MOST107-2314-B-075-051-MY3)
Received: 9 February 2020
Accepted: 28 March 2020
First Online: 15 April 2020
Ethics approval and consent to participate
: This is not applicable for this review.
: We declared that the manuscript is original, has not been published before, and is not currently being considered for publication elsewhere.
: We declared that we have no competing interests.