About the Authors

Gerhard J. Johnson

gerhard.johnson@va.gov

Affiliations Department of Veterans Affairs Health Care System, Minneapolis, Minnesota, 55417, United States of America, Department of Medicine, University of Minnesota, Minneapolis, Minnesota, 55455, United States of America

Billie C. S. Slater

Affiliation Department of Veterans Affairs Health Care System, Minneapolis, Minnesota, 55417, United States of America

Linda A. Leis

Affiliation Department of Veterans Affairs Health Care System, Minneapolis, Minnesota, 55417, United States of America

Thomas S. Rector

Affiliations Department of Veterans Affairs Health Care System, Minneapolis, Minnesota, 55417, United States of America, Department of Medicine, University of Minnesota, Minneapolis, Minnesota, 55455, United States of America

Ronald R. Bach

Affiliations Department of Veterans Affairs Health Care System, Minneapolis, Minnesota, 55417, United States of America, Department of Medicine, University of Minnesota, Minneapolis, Minnesota, 55455, United States of America

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: RB GJ BS. Performed the experiments: BS LL. Analyzed the data: RB GJ BS LL TR. Wrote the paper: GJ RB BS LL TR.