Cerebrospinal fluid ßA42 is increased early in sporadic Alzheimer s disease and declines with disease progression - Jensen, M; Schröder, J; Blomberg, M; Engvall, B; Pantel, J; Ida, N; Basun, H; Wahlund, L-O; Werle, E; Jauss, M; Beyreuther, K; Lannfelt, L; Hartmann, T (Ann Neurol, 1999)