DRD2 and Parkinson disease: Bakker P.R. et al. (2012) demonstrated that the SNV rs6275 of the DRD2 gene was associated with the risk of AP-induced resting tremor (p = 0.0140) in schizophrenic patients tested using the Abnormal Involuntary Movement Scale (AIMS) and the Unified Parkinson’s Disease Rating Scale (UPDRS) [66].