IC‐P‐221: TAU ACCUMULATION PREDICTS PROGRESSION OF DEMENTIA IN SUBJECTS WITH EARLY ALZHEIMER'S DISEASE IN THE ALZHEIMER'S DISEASE SPECTRUM: A [11C]PBB3 POSITRON EMISSION TOMOGRAPHY STUDY. (1st July 2006) - Tagai, Kenji; Shimada, Hitoshi; Kitamura, Soichiro; Takahata, Keisuke; Kubota, Manabu; Takado, Yuhei; Shinotoh, Hitoshi; Nakano, Yoshikazu; Ishii, Tatsuya; Hirano, Shigeki; Shigeta, Masahiro; Suhara, Tetsuya; et al.