Hereditary thrombophilia: Identification of nonsense and missense mutations in the protein C gene - Romeo, G; Hassan, H J; Staempfli, S; Roncuzzi, L; Cianetti, L; Leonardi, A; Vicente, V; Mannucci, P M; Bertina, R; Peschle, C; Cortese, R (Proc Natl Acad Sci USA, 1987)