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doi: 10.1158/1055-9965.EPI-09-0372

Q&A: Chronic Urticaria Linked With Gastrointestinal Symptoms & B12 Deficiency Among patients with chronic urticaria and vitamin B12 deficiency, 68% reported gastrointestinal symptoms
I don't have any literature to back this up but only my personal experience

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patients with marble-like appearance and palpable fibrous bands into the moderate stage
