Text and Data Mining valid from 2020-03-10
Received: 25 December 2019
Accepted: 24 February 2020
First Online: 10 March 2020
Ethics approval and consent to participate
: The study protocol complies with the Declaration of Helsinki and was approved by the Institutional Review Board of the Chang Gung Medical Foundation.
: Not applicable.
: The authors declare that they have no competing interests.