@article{Imai2007,
author = {Imai, K. and Soneji, S.},
title= {On the estimation of disability-free life expectancy: Sullivan's method and its extension.},
year = {2007},
doi = {10.1198/016214507000000040},
journal = {Journal of the American Statistical Association},
volume = {102},
number = {480},
pages = {1199--1211},
}