Female gender and resistance to activated protein C (FV:Q506) as potential risk factors for thrombosis after elective hip arthroplasty - Svensson, PJ; Benoni, G; Fredin, H; Björgell, O; Nilsson, P; Hedlund, U; Nylander, G; Bergqvist, D; Dahlbäck, B (Thromb Haemost, 1997)