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The editors are grateful to:
Richard Doll, University of Oxford, for drawing attention to this record;
Jon Pollock for the photograph of his father, Martin Pollock;
and to the Archive Department of the Royal London Hospital for the portrait of Clifford Wilson.
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.