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Vitamin B12 Deficiency: Causes, Symptoms, and Treatment Evaluation of vitamin B12 levels among severe obese and obese adolescents Mehmet Semih Demirtas, Cengizhan Kilicaslan, Huseyin Erdal, 2024 Can long term smoking cause vitamin B12 deficiency? Can Vitamin B12 Deficiency Indicate Cancer? Know Warning Signs
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