[Letter: Vitamin B 12 absorption in resection of the small intestine for extreme obesity].
D006801:Humans; D007408:Intestinal Absorption; D007421:Intestine, Small / Q000601:surgery*; D009765:Obesity / Q000601:surgery*; D014805:Vitamin B 12 / Q000378:metabolism*
D014805:Vitamin B 12
Vitamin-B12-Resorption bei Dünndarmausschaltung wegen extremer Adipositas.