About the Authors

Ruiling Liu

Affiliation Department of Environmental Health Sciences, University of California Berkeley, Berkeley, California, United States of America

Yuan Jiang

Affiliation National Tobacco Control Office, Chinese Center for Disease Control and Prevention, Beijing, China

Qiang Li

Affiliation Department of Psychology, University of Waterloo, Waterloo, Ontario, Canada

S. Katharine Hammond

hammondk@berkeley.edu

Affiliation Department of Environmental Health Sciences, University of California Berkeley, Berkeley, California, United States of America

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: RL SKH. Performed the experiments: RL. Analyzed the data: RL. Contributed reagents/materials/analysis tools: RL QL YJ. Wrote the paper: RL SKH. Provided data: QL YJ. Data acquisition: QL YJ. Provided critical comments: QL YJ.