Ukoumunne O C, Gulliford M C, Chinn S, Sterne J A, Burney P G, Donner A
Department of Public Health Sciences, Guy's, King's, and St Thomas's School of Medicine, King's College, London SE1 3QD.
BMJ. 1999 Aug 7;319(7206):376-9. doi: 10.1136/bmj.319.7206.376.