About the Authors
Department of Genetics, Stanford University, Stanford, California, United of States of America
Division of Biostatistics, School of Public Health, University of California Berkeley, Berkeley, California, United States of America
The authors have declared that no competing interests exist.
Conceived and designed the experiments: AL GS. Performed the experiments: AL. Analyzed the data: KDH JB SD GS. Contributed reagents/materials/analysis tools: KDH JB. Wrote the paper: AL KDH JB SD GS.