P2‐271: ADDIA, A MULTICENTER CLINICAL STUDY OF PROOF‐OF‐PERFORMANCE TO VALIDATE BLOOD‐BASED BIOMARKERS FOR THE DIAGNOSIS OF ALZHEIMER'S DISEASE (AD): THE STUDY PROTOCOL. (1st July 2006) - Dubois, Bruno; Bier, Jean-Christophe; Blanc, Frederic; David, Renaud; Démonet, Jean-François; Firat, Hüseyin; Frisoni, Giovanni B.; Gabelle, Audrey; Gurvit, Hakan I.; Ivanoiu, Adrian; Magnin, Eloi; Marizzoni, Moira; et al.