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Hair, nail, and pigment changes in major systemic disease ScienceDirect How Vitamin B12 Deficiency Affects Nails Core Med Science Reversible Melanonychia Revealing Nutritional Vitamin B12 Deficiency PMC Melanonychia: Etiology, Diagnosis, and Treatment PMC Brown nails as clues for shock diagnosis Inaba 2025 Journal of General and Family Medicine Wiley Online Library
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