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; Mazzuca, A; Savoia, M; Veri, L; Fiori, F; Gaspari, G; Palareti, A (Thromb Haemostas, 1987)