Clinical Performance of the Elecsys CSF pTau181/Aβ42 Ratio for Concordance with Tau-PET in Two Independent Cohorts. - Smith, Ruben; Shaw, Leslie; Palmqvist, Sebastian; Mattsson-Carlgren, Niklas; Klein, Gregory; Tonietto, Matteo; Quijano-Rubio, Clara; Rank, Christopher M.; Andreadou, Myrto; Burnham, Samantha C.; Stomrud, Erik (Neurology & Therapy, 2025)