The goal of this observational study is to assess the value of the Vietnamese smell identification test (VSIT) in the diagnosis of Parkinson's disease, and compare it with the commonly used test in the world, Brisk smell identification test (BSIT) The main questions it aims to answer are: * The sensitivity, specificity, positive predictive value, and negative predictive value of the VSIT in the diagnosis of Parkinson's disease? * The sensitivity, specificity, positive predictive value, and negative predictive value of the BSIT in the diagnosis of Parkinson's disease? * Factors that associated with olfactory identification ability in PD patients? Process: * Participants will be assessed cognitive station using MMSE * Information on socio-demographic including age, gender, education, occupation, place of residence of both groups, and disease-related characteristics will be collected. * Participants with Parkinson disease will be then assessed with the following instruments: Movement Disorder Society Unified Parkinson's Disease Rating Scale (MDS-UPDRS), Hoehn \& Yarh scale, and Beck Depression Inventory * The case and control groups will be assessed by the Vietnamese Smell Identification Test and Brisk Smell Identification Test
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The VSIT score of both groups
Timeframe: From May 2023 to May 2025