Snell ES, Armitage P (1957)

Clinical comparison of diamorphine and pholcodine as cough suppressants by a new method of sequential analysis. Lancet 1:860-862

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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.