TY  - JOUR
A1  - Keiding, N.
A1  - Andersen, P.K.
A1  - Klein, J.P.
T1  - The role of frailty models and accelerated failure time models in describing heterogeneity due to omitted covariates
Y1  - 1997
JF  - Statistics in Medicine
VL  - 16
IS  - 2
SP  - 215
EP  - -224

ER  -