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The editors are grateful to:
Sjúrður Fróði Olsen, Danish Epidemiology Science Centre, Copenhagen, for drawing attention to this record.
Professor Charles Rodeck for supplying the photographic portrait of Dr Theobald.
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.