Hereditary protein S deficiency and venous thrombo-embolism. A study in three Dutch families - Broekmans, AW; Bertina, RM; Reinalda-Poot, J; Engesser, L; Muller, HP; Leeuw, JA; Michiels, JJ; Brommer, EJP; Briët, E (Thromb Haemost, 1985)