TY  - JOUR
PY  - 2002//
TI  - The effect of missing values for covariates
JO  - Epidemiology
A1  - Whitlock, G.
A1  - Clark, Tony
SP  - 113
EP  - 113
VL  - 13
IS  - 1
N2  - Abstract unavailable.
LA  - 
SN  - 1044-3983
UR  - http://dx.doi.org/
ID  - ref1
ER  -