1. The Atherosclerosis Program/Northwestern University, Rehabilitation Institute of Chicago, Illinois
2. The University of California, San Diego, LaJolla, California
3. The Mayo Clinic/Special Coagulation Lab, Rochester, Minnesota, U.S.A.
4. The I. Medizinische Universitätsklinik, Vienna, Austria
5. The Universita Degli Studi Di Milano, Milan, Italy
6. The Oxford Haemophilia Centre, Oxford, England
7. The Service d'Hematologie de I'Hdpital Cochin, Paris, France