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. 2026 Jul 2;16(8):654. doi: 10.21037/qims-2025-1-2814

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Patient selection flowchart. FBG, fasting blood glucose; HbA1c, hemoglobin A1c; HC, healthy control; MoCA, Montreal cognitive assessment; MRI, magnetic resonance imaging; PD, Parkinson’s disease; T2DM-MCI, type 2 diabetes mellitus with mild cognitive impairment; T2DM-nMCI, type 2 diabetes mellitus without mild cognitive impairment.