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 the pdf’s of this article available (letter to Iain Chalmers from Laura Pritchard, 14 May 2014). For conditions of further reproduction, see here.

BMJ for allowing the James Lind Library to link to this and other BMJ articles of historical relevance (email to Iain Chalmers from Fiona Godlee, 05 May 2015).