@article{Mitnitski2002,
author = {Mitnitski, A. and Graham, J. and Mogilner, A. and Rockwood, K.},
title= {Frailty, fitness and late-life mortality in relation to chronological and biological age},
year = {2002},
journal = {BMC Geriatrics},
volume = {2},
number = {1},
pages = {1},
}