Thromboprophylaxis in patients with hip fractures: A prospective, randomized, comparative study between Org 10172 and Dextran 70 - Bergqvist, D; Kettunen, K; Fredin, H; Fauno, P; Suomalainen, O; Soimakallio, S; Karjalainen, P; Cederholm, C; Jensen, L J; Justesen, T; Stiekema, J C J (Surgery, 1991)