Alterations in binding site density of dopamine transporter in the striatum, orbitofrontal cortex, and amygdala in early Parkinson’s disease: compartment analysis for beta-CFT binding with positron emission tomography - Ouchi, Y; Yoshikawa, E; Okada, H; Futatsubashi, M; Sekine, Y; Iyo, M; Sakamoto, M (Ann Neurol, 1999)