Prolonged prophylaxis with unfractionated heparin is effective to reduce delayed deep vein thrombosis in total hip replacement - Manganelli, D; Pazzagli, M; Mazzantini, D; Punzi, G; Manca, M; Vignali, C; Palla, A; Troiani, R; Rossi, G; Palla, A (Respiration, 1998)