Text and Data Mining valid from 2019-12-01
Received: 3 September 2019
Accepted: 4 December 2019
First Online: 19 December 2019
Ethics approval and consent to participate
: The study was exempted from reviews by the Institutional Review Board because this study used the publicly available dataset deposited in the public repositories.
: Not applicable
: The authors declare that they have no competing interests.