About the Authors

Jiawei Bai

jbai@jhsph.edu

Affiliation Department of Biostatistics, Johns Hopkins University, Baltimore, Maryland, United States of America

Chongzhi Di

Affiliation Division of Public Health Sciences, Fred Hutchinson Cancer Research Center, Seattle, Washington, United States of America

Luo Xiao

Affiliation Department of Statistics, North Carolina State University at Raleigh, Raleigh, North Carolina, United States of America

Kelly R. Evenson

Affiliation Department of Epidemiology, Gillings School of Global Public Health, University of North Carolina–Chapel Hill, Chapel Hill, North Carolina, United States of America

Andrea Z. LaCroix

Affiliation Division of Epidemiology, Department of Family Medicine and Public Health, University of California San Diego, La Jolla, California, United States of America

Ciprian M. Crainiceanu

Affiliation Department of Biostatistics, Johns Hopkins University, Baltimore, Maryland, United States of America

David M. Buchner

Affiliation Department of Kinesiology and Community Health, University of Illinois at Urbana-Champaign, Champaign, Illinois, United States of America

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: JB CD LX CMC DMB. Performed the experiments: JB CD. Analyzed the data: JB CD CMC. Contributed reagents/materials/analysis tools: JB CD KRE AZL CMC DMB. Wrote the paper: JB CD KRE CMC. Data collection: KRE AZL DMB.