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Total melanonychia of 20 nails as a rare manifestation of vitamin B12 deficiency JAAD Case Reports Melanonychia: Etiology, Diagnosis, and Treatment PMC How Vitamin B12 Deficiency Affects Nails Core Med Science Nail Disorders Due to Environmental, Professional, and Cosmetic Causes and Auto induced Nail Diseases Springer Nature Link Reversible Melanonychia Revealing Nutritional Vitamin B12 Deficiency PMC Brown nails as clues for shock diagnosis Inaba 2025 Journal of General and Family Medicine Wiley Online Library
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