FOLH1 and Parkinson disease: Although promising outcomes regarding the PSMA functional connectivity and metabolic activity have been separately obtained by fMRI and 18F-fluorodeoxyglucose (FDG) PET studies (Ma et al., 2007; Wu et al., 2011; Thibes et al., 2017), yet how functional connectome of the PSMA associate with glucose metabolism in PD patients against the healthy population is still obscure.