GFK DANMARK A/S, GFK DANMARK A/S, HOLDINGSELSKABET AF 6. DECEMBER 1982 A/S, HOLDINGSELSKABET AF 6. DECEMBER 1982 A/S, I&G NORDIC MEDICAL RESEARCH A/S, I&G NORDIC MEDICAL RESEARCH A/S, GFK DANMARK A/S, GFK DANMARK A/S, PDS-RESEARCH ApS, PDS-RESEARCH ApS