Guidelines for prevention of thromboembolic events in valvular heart disease - Gohlke-Bärwolf, C; Acar, J; Burckhardt, D; Oakley, C; Butchart, E; Krayenbühl, P; Hall, R; Bodnar, E; Krzeminska-Pakula, M; Delahaye, JP; Samama, M; b(Ad Hoc Committee of the Working Group on Valvular Heart Disease, European Society of Cardiology (J Heart Valve Dis, 1993)