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However, about 15 percent of the population has a vitamin B12 deficiency

doi: 10.1016/S0002-9343(98)00179-X 358 KuratsuneHYamagutiKLindhGEvengrdBHagbergGMatsumuraKet al

A patient with B12 deficiency following Roux-en-Y gastric bypass receives D51.8 because the small intestine cannot properly absorb B12 despite adequate intrinsic factor production

doi: 10.1016/j.plefa.2005.04.011
