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Showing articles 0 to 2 of 2 Filter Applied: methylmalonic acid,serum (Click to remove) Clinicopathologic Conference, Functional Vitamin B12 Deficiency from Use of Nitrous Oxide NEJM 388:1893-1900, Case 15-2023, 2023 Clinicalpathologic Conference, Vitamin B12 Deficiency due to Pernicious Anemia NEJM 366:1626-1633, Case 13-2012, 2012 Showing articles 0 to 2 of 2