About the Authors

Dennis L. Chao

dchao@fhcrc.org

Affiliation Center for Statistics and Quantitative Infectious Diseases, Vaccine and Infectious Disease Division, Fred Hutchinson Cancer Research Center, Seattle, Washington, United States of America

Ira M. Longini Jr

Affiliation Department of Biostatistics, College of Public Health and Health Professions, and Emerging Pathogens Institute, University of Florida, Gainesville, Florida, United States of America

M. Elizabeth Halloran

Affiliations Center for Statistics and Quantitative Infectious Diseases, Vaccine and Infectious Disease Division, Fred Hutchinson Cancer Research Center, Seattle, Washington, United States of America, Department of Biostatistics, School of Public Health, University of Washington, Seattle, Washington, United States of America

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

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