About the Authors

Joseph J. Putila

Affiliations Mary Babb Randolph Cancer Center, West Virginia University, Morgantown, West Virginia, United States of America, Department of Community Medicine, West Virginia University, Morgantown, West Virginia, United States of America

Nancy Lan Guo

lguo@hsc.wvu.edu

Affiliations Mary Babb Randolph Cancer Center, West Virginia University, Morgantown, West Virginia, United States of America, Department of Community Medicine, West Virginia University, Morgantown, West Virginia, United States of America

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: NLG. Performed the experiments: JP. Analyzed the data: JP. Contributed reagents/materials/analysis tools: NLG. Wrote the paper: JP NLG.