Some aspects of Crohn's disease.
D000748:Anemia, Macrocytic / Q000209:etiology; D003424:Crohn Disease / Q000150:complications* / Q000601:surgery; D005500:Follow-Up Studies; D006801:Humans; D007408:Intestinal Absorption; D008286:Malabsorption Syndromes; D011183:Postoperative Complications; D011379:Prognosis; D014805:Vitamin B 12 / Q000652:urine
D014805:Vitamin B 12