Four cases of venous thrombosis in athletes with silent hereditary defects of the protein C system - De Caterina, Maurizio; Grimaldi, Ernesto; Passaretti, Maria; Ruocco, Aldo; Selvetella, Lucio; Cavallaro, Vincenzo; Di Biase, Sebastiano; Scopacasa, Francesco (Thrombosis and Haemostasis, 2005)