Failure of oral therapy in the maintenance of pernicious anemia.
D000740:Anemia; D000752:Anemia, Pernicious / Q000628:therapy*; D006397:Hematinics; D014805:Vitamin B 12 / Q000628:therapy*
D006397:Hematinics; D014805:Vitamin B 12
ANEMIA, PERNICIOUS/therapy; VITAMIN B 12/therapy