tokens: Acknowledgments We thank the anonymous referee for their comments and suggestions, which have greatly improved the paper. We also thank Kevin Luhman for making his data available to us prior to publication, and for comments and suggestions on the original manuscript. We thank the authors of Parker etal. ( 2014 ) for providing the material for Section 3.1 . RJP acknowledges support from the Royal Society in the form of a Dorothy Hodgkin Fellowship.
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