Echo-Doppler for early diagnosis of deep venous thrombosis in orthopedic surgery and traumatology. A retrospective study of 1 647 patients - Barrellier, MT; Bosson, JL; Vignon, C; Rousseau, JF; Besnard, M; Boissel, M; Fauchon, G; Pegoix, M; Thomassin, C; Trahay, A (J Mal Vasc, 1994)