Ryan M P, French J, al-Mahdawi S, Nihoyannopoulos P, Cleland J G, Oakley C M, Harper P S, Clarke A, Davis J, Grigg L
Department of Clinical Cardiology, Royal Postgraduate Medical School, Hammersmith Hospital, London.
BMJ. 1995 Apr 1;310(6983):856-9. doi: 10.1136/bmj.310.6983.856.