The Functional Social Maturity Scale: a novel diagnostic method for assessing adaptive behaviour in the diagnostic process of intellectual development disorders. - Sajewicz-Radtke, Urszula; Łada-Maśko, Ariadna Beata; Jurek, Paweł; Olech, Michał; Radtke, Bartosz Mikołaj (Journal of Psychiatry & Clinical Psychology / Psychiatria i Psychologia Kliniczna, 2024)