Text and Data Mining valid from 2019-05-07
First Online: 7 May 2019
Compliance with Ethical Standards
: This study was exempt from University of Michigan Institutional Review Board oversight.
: The authors declare that they do not have a conflict of interest.
: The funding sources had no role in the design and conduct of the study; collection, management, analysis, and interpretation of the data; preparation, review, or approval of the manuscript; and decision to submit the manuscript for publication.