Audiometree, Belgium
EOS - Gallup Europe, Belgium
GfK - European Opinion Research Centre EEIG, Belgium
GfK, Bulgaria
GfK, Croatia
Hendal, Croatia
IMAS, Austria
Integral Austria
Kaktins, Latvia
Karmasin Marktforschung, Austria
Mareco, Czech Republic
Mareco, Poland
Mediana Fides, Croatia
MIB, Bosnia and Herzegovina
PULS, Bosnia and Herzegovina
PULS, Croatia
SKDS, Latvia
Target, Croatia
Uniqa, Austria