TY - JOUR A1 - Cai, L. A1 - Schenker, N. A1 - Lubitz, J. T1 - Analysis of functional status transitions by using a semi-Markov process model in the presence of left-censored spell Y1 - 2006 DO - 10.1111/j.1467-9876.2006.00548.x JF - Journal of the Royal Statistical Society: Series C (Applied Statistics) VL - 55 IS - 4 ER -