Oral anticoagulant therapy control: evidence that INR expression improves the interlaboratory comparability of results. The Bologna oral anticoagulant control exercise - Palareti, G; Coccheri, S; Poggi, M; Bonetti, M; Cervi, V; Mazzucca, A; Savoia, M; Veri, L; Fiori, F; Gaspari, G; Palareti, A (Thromb Haemost, 1987)