Latent-profile analysis of sleep disturbances, cognitive performance and neuropsychiatric symptoms reveals subtypes of Parkinson's disease. - El Haffaf LM; Domellöf ME; Ronat L; Monchi O; Walton L; Bäckström D; Boraxbekk CJ; Forsgren L; Nyberg L; Neely AS; Johansson J (Frontiers in neurology, 2026)