TY  - JOUR
A1  - Therneau, T.M.
A1  - Crowson, C.
T1  - Using time dependent covariates and time dependent coefficients in the Cox model
Y1  - 2014
UR  - http://cran.r-project.org/web/packages/survival/vignettes/timedep.pdf
%[21 March 2014

ER  -