About the Authors

Sean L. Simpson

slsimpso@wakehealth.edu

Affiliations Department of Biostatistical Sciences, Wake Forest School of Medicine, Winston-Salem, North Carolina, United States of America, Department of Biostatistics, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, United States of America

Lloyd J. Edwards

Affiliation Department of Biostatistics, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, United States of America

Martin A. Styner

Affiliation Departments of Psychiatry and Computer Science, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, United States of America

Keith E. Muller

Affiliation Department of Health Outcomes and Policy, University of Florida, Gainesville, Florida, United States of America

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Performed the experiments: SS LE MS KM. Analyzed the data: SS LE MS KM. Contributed reagents/materials/analysis tools: SS LE MS KM. Wrote the paper: SS LE KM.