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A checklist designed to aid consistency and reproducibility of GRADE assessments: development and pilot validation

Vitamin B12 helps in the production of red blood cells, which carry oxygen throughout the body

15 In a study that compared heme and nonheme iron absorption in patients before and after undergoing RYGB (n=20) or VSG (n=20) procedures, researchers discovered that both surgical procedures resulted in a significant decrease in absorption of each type of iron

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