About the Authors
Department of Human Genetics, University of Chicago, Chicago, Illinois, United States of America
Department of Statistics, University of Chicago, Chicago, Illinois, United States of America
The authors have declared that no competing interests exist.
Conceived and designed the experiments: YG MS. Performed the experiments: YG. Analyzed the data: YG MS. Contributed reagents/materials/analysis tools: YG MS. Wrote the paper: YG MS.