Iodine-123 labelled Z-(R.R)-IQNP: a potential radioligand for visualization of M(1)and M(2) muscarinic acetylcholine receptors in Alzheimer’s disease - Bergström, KA; Halldin, C; Savonen, A; Okubo, Y; Hiltunen, J; Nobuhara, K; Swahn, CG; Karlsson, P; McPherson, D; Knapp, FF; Larsson, S; Schnell, PO; Farde, L (Eur J Nucl Med, 1999)