TY  - JOUR
A1  - Remschmidt, C.
A1  - Wichmann, O.
A1  - Harder, T.
T1  - Frequency and impact of confounding by indication and healthy vaccinee bias in observational studies assessing influenza vaccine effectiveness: a systematic review
Y1  - 2015
DO  - 10.1186/s12879-015-1154-y
UR  - https://doi.org/10.1186/s12879-015-1154-y
VL  - 15
IS  - 429

ER  -