Genetic heterogeneity in hereditary haemorrhagic telangiectasia: possible correlation with clinical phenotype - McAllister, K A; Lennon, F; Bowles-Biesecker, B; McKinnon, W C; Helmbold, E A; Markel, D S; Jackson, C E; Guttmacher, A E; Pericak-Vance, M A; Marchuk, D A (J Med Genet, 1994)