References
- Cooper B. A., Whitehead M. Evidence that some patients with pernicious anemia are not recognized by radiodilution assay for cobalamin in serum. New Engl. J. Med. 1978; 299: 816
- Kolhouse J. F., Kondo H., Allen N. C., Podell E., Allen R. H. Cobalamin analogues are present in human plasma and can mask cobalamin deficiency because current radioisotope dilution assays are not specific for true cobalamin. New Engl. J. Med. 1978; 299: 785