TY - JOUR A1 - Aalen, O. A1 - Borgan, Ø. A1 - Fekjær, H. T1 - Covariate Adjustment of Event Histories Estimated from Markov Chains: The Additive Approach Y1 - 2001 DO - 10.1111/j.0006-341X.2001.00993.x JF - Biometrics VL - 57 IS - 4 SP - 993 EP - -1001 ER -