TY  - GEN
AU  - Hak,E
AU  - Verheij,Th J M
AU  - Grobbee,D E
AU  - Nichol,K L
AU  - Hoes,A W
TI  - Confounding by indication in non-experimental evaluation of vaccine effectiveness: the example of prevention of influenza complications
SN  - 0143-005X
PY  - 2003///0131
KW  - Adult
KW  - Confounding Factors, Epidemiologic
KW  - Humans
KW  - Influenza Vaccines
KW  - Influenza, Human
KW  - complications
KW  - Randomized Controlled Trials as Topic
KW  - Research Design
KW  - Statistics as Topic
KW  - Vaccination
N1  - Publication Type: Journal Article; Research Support, Non-U.S. Gov't; Review
UR  - https://doi.org/10.1136/jech.56.12.951
ER  -