1. Thrombosis Research Institute, Emmanuel Kaye Building, Manresa Road, London SW3 6LR, U.K.
2. Lehman College and Graduate Center of The City University of New York, Bronx, NY 10468, U.S.A.
3. Kabi-Pharmacia AB, S-112 87 Stockholm, Sweden
4. Preclinical Research, Sandoz Pharma Ltd., CH-4002, Basel, Switzerland