13 Furthermore, a recent systematic review and meta-analysis of 1484 patients with type 2 diabetes has demonstrated a highly significant association (OR −2.68) between vitamin D deficiency and the development of diabetic peripheral neuropathy. 14 A more detailed study using electrophysiology and Douleur Neuropathique 4 (DN4) scores has shown that serum levels of vitamin D are significantly reduced while serum vitamin D-binding prote
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