No abstract available
MeSH terms
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Aged
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Anemia, Pernicious / genetics*
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Bone Marrow Examination
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Erythropoiesis
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Female
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Gastric Acidity Determination
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Gastric Juice / metabolism
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Gastroscopy
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Humans
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Intestinal Absorption
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Mexico
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Schilling Test
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Vitamin B 12 / metabolism