Spyropoulos AC, Anderson FA, FitzGerald G, Decousus H, Pini M, Chong BH, Zotz RB, Bergmann JF, Tapson V, Froehlich JB, Monreal M, Merli GJ, Pavanello R, Turpie AGG, Nakamura M, Piovella F, Kakkar AK, Spencer FA. Predictive and associative models to identify hospitalized medical patients at risk for VTE. Chest. 2011 Sep; 140(3):706-714.