Text and Data Mining valid from 2019-09-04
Received: 7 February 2019
Accepted: 9 August 2019
First Online: 4 September 2019
Ethics approval and consent to participate
: All the data used in this study were extracted from a medical center; thus, we obtained ethical approval according to the regulation of the Taiwan Ministry of Health and Welfare. The document was coded (No. 10602-E03) and approved by the IRB of the Chi Mei Medical Center, Taiwan.
: Not applicable.
: The authors declare that they have no competing interests.