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Total melanonychia of 20 nails as a rare manifestation of vitamin B12 deficiency JAAD Case Reports Melanonychia: What It Is, Causes & Treatment Reversible Melanonychia Revealing Nutritional Vitamin B12 Deficiency PMC Blue Nail Discoloration: Literature Review and Diagnostic Algorithms American Journal of Clinical Dermatology Springer Nature Link Vitamin B12 Deficiency and its Numerous Skin Manifestations Actas Dermo Sifiliogrficas Melanonychia: Etiology, Diagnosis, and Treatment PMC
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