title: The long-term relationship between serum vitamin B12 and total body vitamin B12.
mesh_terms: D000328:Adult; D000368:Aged; D000752:Anemia, Pernicious / Q000097:blood / Q000188:drug therapy / Q000378:metabolism*; D001681:Biological Assay; D001823:Body Composition; D003036:Cobalt Isotopes; D003038:Cobamides / Q000627:therapeutic use; D003677:Deficiency Diseases / Q000188:drug therapy / Q000378:metabolism; D005056:Euglena gracilis; D005260:Female; D005743:Gastrectomy; D006801:Humans; D006879:Hydroxocobalamin / Q000627:therapeutic use; D007501:Iron; D008297:Male; D008875:Middle Aged; D013270:Stomach / Q000502:physiology; D013997:Time Factors; D014805:Vitamin B 12 / Q000097:blood / Q000378:metabolism* / Q000627:therapeutic use
chemical_list: D003036:Cobalt Isotopes; D003038:Cobamides; D007501:Iron; D014805:Vitamin B 12; D006879:Hydroxocobalamin