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Gong Y, Md , Kang KD, Md , Phd , Kim HS, Md , Phd , Hwang HB, Md , Phd .  Correlation between Ocular Surface Staining Score and Serum Vitamin D in Sjögren’s and Non-Sjögren’s Syndrome.  Ann Optom Contact Lens 2021;20:32-38.