Homozygous and heterozygous deletions of the von Willebrand factor gene in patients and carriers of severe von Willebrand disease - Ngo, K Y; Trifard Glotz, V; Koziol, J A; Lynch, D C; Gitschier, J; Ranieri, P; Ciavarella, N; Ruggeri, Z M; Zimmerman, T S (Proc Natl Acad Sci USA, 1988)