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Ulcer on the ventral region of the tongue in a patient with vitamin B12 deficiency

(Source:Xu X, Liu Y, Xiong X, et al. Diagnostic value of oral "beefy red" patch combined with fingertip blood mean corpuscular volume in vitamin B12 deficiency. BMC Oral Health 2022;22[1]:273. Creative Commons Attribution 4.0 International License, http://creativecommons.org/licenses/by/4.0.)

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