Vardas P E, Travill C M, Williams T D, Ingram A M, Lightman S L, Sutton R
Department of Cardiology, Charing Cross and Westminster Medical School, Westminster Hospital, London.
Br Med J (Clin Res Ed). 1988 Jan 9;296(6615):94. doi: 10.1136/bmj.296.6615.94.