Parkinson’s Disease -- Magnetic Resonance Imaging and Magnetic Resonance Spectroscopy in Parkinson’s Disease -- Positron Emission Tomography and Single-Photon Emission Tomography in the Diagnosis of Parkinson’s Disease -- Positron Emission Tomography in Parkinson’s Disease -- [123I]-Altropane SPECT -- Positron Emission Tomography and Embryonic Dopamine Cell Transplantation in Parkinsonâ…