Homozygous and heterozygous deletions of the von Willebrand factor gene in patients and carriers of severe von Willebrand disease - Ngo, KY; Glotz, VT; Koziol, JA; Lynch, DC; Gitschier, J; Ranieri, P; Ciavarella, N; Ruggeri, ZM; Zimmerman, TS (Proc Natl Acad Sci USA, 1988)