MacLeod A, Grant A, Donaldson C, Khan I, Campbell M, Daly C, Lawrence P, Wallace S, Vale L, Cody J, Fitzhugh K, Montague G, Ritchie C
Department of Medicine and Therapeutics, University of Aberdeen, UK, and Aberdeen Royal Hospitals, NHS Trust, Aberdeen, UK.
Health Technol Assess. 1998;2(5):1-166.