Department of Neurology Henan Provincial People''s Hospital School of Clinical Medicine Henan University Zhengzhou 450003 China;
Department of Neurology Henan Provincial People''s Hospital School of Clinical Medicine Henan University Zhengzhou 450003 ChinaDepartment of Neurology People''s Hospital of Zhengzhou University School of Clinical Medicine Zhengzhou University Zhengzhou 450003 China;
Parkinson''s disease; Peripheral neuropathy; Corneal confocal microscopy; Small fiber neuropathy;