@article{Cai2006,
author = {Cai, L. and Schenker, N. and Lubitz, J.},
title= {Analysis of functional status transitions by using a semi-Markov process model in the presence of left-censored spell},
year = {2006},
doi = {10.1111/j.1467-9876.2006.00548.x},
journal = {Journal of the Royal Statistical Society: Series C (Applied Statistics)},
volume = {55},
number = {4},
pages = {477--491},
}