[Studies of B12 absorption test with dual-isotope method].
D000293:Adolescent; D000328:Adult; D000368:Aged; D000752:Anemia, Pernicious / Q000652:urine; D002648:Child; D003037:Cobalt Radioisotopes; D005260:Female; D006801:Humans; D008286:Malabsorption Syndromes / Q000652:urine; D008297:Male; D008722:Methods; D008875:Middle Aged; D014805:Vitamin B 12 / Q000652:urine*
D003037:Cobalt Radioisotopes; D014805:Vitamin B 12