Hereditary protein S deficiency and venous thromboembolism. A study in three Dutch families - Broekmans, A W; Bertina, R M; Reinalda-Poot, J; Engesser, L; Muller, H P; Leeuw, J A; Michiels, J J; Brommer, E JP; Briët, E (Thromb Haemost, 1985)