Pell J P, MacIntyre K, Walsh D, Capewell S, McMurray J J V, Chalmers J W T, Boyd J H, Finlayson A R, Stewart S, Redpath A D
Department of Medical Cardiology, Glasgow Royal Infirmary University NHS Trust, Glasgow G32 2ER, Scotland, UK.
BMJ. 2002 Jan 26;324(7331):201-2. doi: 10.1136/bmj.324.7331.201.