The cholinergic system in subtypes of Alzheimer's disease: an in vivo longitudinal MRI study. Alzforum, 15 May 2020 Machado A, Ferreira D, Grothe MJ, Eyjolfsdottir H, Almqvist PM, Cavallin L, Lind G, Linderoth B, Seiger Å, Teipel S, Wahlberg LU…