"H2 histaminergic antagonists (e.g. ranitidine) for >1 year"
"POEMS syndrome 4"
Expected headings
"Insufficient intrinsic factor"
"Ileal malabsorption"
"Genetic"
"Nutritional"
"Pharmacological"
"Other"
"There are significant stores of vitamin B12 (cobalamin) in the hepatocytes meaning that symptoms may not become evident for up to a decade after biochemical depletion first occurs."