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Description
An update International journal of laboratory hematology,The official journal of the international society of the laboratory hematology, First published: 11 January 2009

Risks Because the duodenum is bypassed, limited absorption of iron and calcium can result in iron deficiency anemia, bone calcium loss and metabolic bone disease in some patients

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Several groups require higher vitamin B12 doses due to increased needs, impaired absorption, or specific health conditions