Text and Data Mining valid from 2019-09-14
Received: 8 July 2019
Accepted: 2 September 2019
First Online: 14 September 2019
Ethics approval and consent to participate
: The data of the manuscript is obtained from the NHIRD, collecting secondhand information for public research purposes and passed the full inspection by the Institutional Review Board of Chung Shan Medical Hospital Committee (CS2–15106).
: Not applicable
: The authors declare that they have no competing interests.