@article{Mitnitski2002,
author = {Mitnitski, A.B. and Graham, J.E. and Mogilner, A.J. and Rockwood, K.},
title= {Frailty, fitness and late-life mortality in relation to chronological and biological age},
year = {2002},
doi = {10.1186/1471-2318-2-1},
volume = {2},
number = {1},
}