About the Authors

Stephen M. Rappaport

srappaport@berkeley.edu

Affiliation School of Public Health, University of California, Berkeley, California, United States of America

Competing Interests

The author has declared that no competing interests exist.

Author Contributions

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