Audit of oral anticoagulant treatment. The BCSH Haemostasis and Thrombosis Task Force of the British Society for Haematology. Issue 12 (December 1993) - Colvin, B T; Machin, S J; Barrowcliffe, T W; Greaves, M; Ludlam, C A; Mackie, I J; Preston, F E; Rose, P E; Walker, I D; Waters, A H