About the Authors

Stephen A. Lauer

slauer@schoolph.umass.edu

Affiliation Division of Biostatistics and Epidemiology, School of Public Health and Health Sciences, University of Massachusetts, Amherst, MA, USA

Ken P. Kleinman

Affiliation Department of Population Medicine, Harvard Medical School/Harvard Pilgrim Health Care Institute, Boston, MA, USA

Nicholas G. Reich

Affiliation Division of Biostatistics and Epidemiology, School of Public Health and Health Sciences, University of Massachusetts, Amherst, MA, USA

Competing Interests

Co-author Nicholas G Reich is a PLOS ONE Editorial Board member. This does not alter the authors’ adherence to PLOS ONE Editorial policies and criteria.

Author Contributions

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