Text and Data Mining valid from 2020-01-13
Received: 1 August 2019
Accepted: 2 January 2020
First Online: 13 January 2020
Ethics approval and consent to participate
: The University of Washington Institutional Review Board reviewed the study design and determined the study to be exempt. The Washington State Institutional Review Board determined that we did not need to submit a form for official determination of exempt status for use of Washington State mortality data for this study.
: Not applicable.
: The authors declare that they have no competing interests.