Some long term effects of smoking on the hemostatic system: a report from the Caerphilly and Speedwell Collaborative Surveys - Yarnell, J WG; Sweetnam, P M; Rogers, S; Elwood, P C; Bainton, D; Baker, I A; Eastham, R; O'Brien, J R; Etherington, M D (J Clin Pathol, 1987)