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Acknowledgements
The editors are grateful to:
Elsevier Ltd. for making a pdf of this article available (letter to Iain Chalmers from Laura Pritchard, 14 May 2014). For conditions of further reproduction, see here.

.jpg)
The editors are grateful to:
Elsevier Ltd. for making a pdf of this article available (letter to Iain Chalmers from Laura Pritchard, 14 May 2014). For conditions of further reproduction, see here.