Mark D McColl, Jane E Ramsay, R C Tait, Isobel D Walker, Frances McCall, J A Conkie, M J Carty, I A Greer,
Risk factors for pregnancy associated venous thromboembolism Thrombosis and Haemostasis. ,vol. 78, pp. 1183- 1188 ,(1997) ,
10.1055/S-0038-1657712