TY - JOUR A1 - Cai, L. A1 - Schenker, N. A1 - Lubitz, J. A1 - Diehr, P. A1 - Arnold, A. A1 - Fried, L.P. T1 - Evaluation of a method for fitting a semi-Markov process model in the presence of left-censored spells using the Cardiovascular Health Study Y1 - 2008 DO - 10.1002/sim.3382 JF - Statistics in Medicine VL - 27 IS - 26 SP - 5509 EP - -5524 ER -