NEFL and supranuclear palsy, progressive, 1: Our decision to group patients with PSP-CBS, PSP-F, and PSP-SL under the term PSP-Cog is common to other studies and is based on the observation that the cortical subtypes and PSP-RS differ on tau brain distribution, while no dissimilarities were reported in CSF-tau or CSF-NFL (Jabbari et al. 2020; Guasp et al. 2021; Tsuboi et al. 2005; Kovacs et al. 2020).