About the Authors
- Richard J. Williams
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* E-mail: ricw@microsoft.com
Affiliation Microsoft Research, Cambridge, United Kingdom
Competing Interests
The author was employed by Microsoft Research when this study was done. This does not affect the authors' ability to comply with PLoSONE's policies on sharing data and materials.
Author Contributions
Conceived and designed the experiments: RJW. Performed the experiments: RJW. Analyzed the data: RJW. Contributed reagents/materials/analysis tools: RJW. Wrote the manuscript: RJW.