About the Authors
Wellcome Trust Centre for Human Genetics, University of Oxford, Oxford, United Kingdom
Department of Statistics, University of Oxford, Oxford, United Kingdom
The authors have declared that no competing interests exist.
Conceived and designed the experiments: CS DV PD. Performed the experiments: CS EH DV. Analyzed the data: CS EH DV PD. Contributed reagents/materials/analysis tools: CS. Wrote the paper: CS PD.