
Keywords: دستگاه عصبی; Olfactory bulb and tract volume; Olfactory dysfunction; MRI; Parkinsonism; meta-iodobenzylguanidine (123I-MIBG) scintigraphy; OSIT-J; odor stick identification test for Japanese; UPDRS; unified Parkinson's Disease Rating Scale; 123I-MIBG scintigraphy; met