1. From the Service of Angiology (L.M., M.K., K.B., J.F.A., H.R.B., J.N., D.H.) and the Service of Hematology (M.A.D, V.V.), CHUV, University of Lausanne, Switzerland; Department of Pathology (H.H., G.G.), University of Geneva, Switzerland. H.H. is currently affiliated with the Department of Pathology, National Cardiovascular Center, Osaka, Fujishirodai, Japan.