About the Authors

John A. Cunningham

John_Cunningham@camh.net

Affiliation Centre for Addiction and Mental Health, and University of Toronto, Toronto, Ontario, Canada

Clayton Neighbors

Affiliation Department of Psychology, University of Houston, Houston, Texas, United States of America

Cameron Wild

Affiliation Centre for Health Promotion Studies, School of Public Health, University of Alberta, Edmonton, Alberta, Canada

Keith Humphreys

Affiliation Veterans Affairs and Stanford University Medical Centers, Stanford, California, United States of America

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: JAC CN CW KH. Performed the experiments: JAC. Analyzed the data: JAC CN. Contributed reagents/materials/analysis tools: JAC. Wrote the paper: JAC CN CW KH.