Text and Data Mining valid from 2018-02-07
First Online: 7 February 2018
Compliance with Ethical Standards
: The Committee on Human Research at the University of California, San Francisco, and the Committee for Research and Development at the San Francisco VA Medical Center approved this study. The corresponding author, Louise Walter, had full access to all of the data in the study and takes responsibility for the integrity of the data and the accuracy of the data analysis. The datasets generated during and/or analyzed during the current study are not publicly available because Veterans Affairs data are not publicly available. However, all datasets used in this study are available to VA investigators through VIReC, ExternalRef removed
: The authors declare that they do not have a conflict of interest.