Deficits in episodic memory and executive functions in relation to CB1 receptor availability in Parkinson's disease. - Ajalin, Riikka M; Al-Abdulrasul, Haidar; Tuisku, Jouni M; Karrasch, Mira; Hirvonen, Jussi; Kirjavainen, Anna K; Zetterberg, Henrik; Rinne, Juha O; Brück, Anna E (Journal of Parkinson's Disease, 2026)