1. From Unitat d‘Hemostàsia i Trombosi (A.B., J.M.S., J.C.S., J.F.), Departament d‘Hematologia, Hospital de la Santa Creu i Sant Pau, Barcelona, Spain; the Department of Genetics (L.A., J.B.), Southwest Foundation for Biomedical Research, San Antonio, Tex; Centre National de Genotypage (M.L.), Évry, France.