[1] UNIV MILAN, A BIANCHI BONOMI HEMOPHILIA & THROMBOSIS CTR, I-20122 MILAN, ITALY
[2] UNIV MILAN, INST INTERNAL MED, I-20122 MILAN, ITALY
[3] NEW ENGLAND HEMOPHILIA CTR, WORCESTER, MA USA
[4] MED CTR CENT MASSACHUSETTS, WORCESTER, MA USA
[5] MIT, WHITAKER COLL, CAMBRIDGE, MA 02139 USA
[6] MIT, DEPT BIOL, CAMBRIDGE, MA 02139 USA
[7] HARVARD UNIV, BROCKTON W ROXBURY DEPT VET AFFAIRS MED CTR, SCH MED, CAMBRIDGE, MA 02138 USA