Commutability of National Institute of Standards and Technology standard reference material 1955 homocysteine and folate in frozen human serum for total folate with automated assays

H Ihara, T Watanabe, N Hashizume, M Totani, K Kamioka, K Onda, S Sunahara, T Suzuki, M Itabashi, Y Aoki, M Ishibashi, S Ito, K Ohashi, T Enomoto, K Saito, K Saeki, Y Nagamura, T Nobori, K Hirota, K Fujishiro, M Maekawa, M Miura and Y. Ohta

Annals of Clinical Biochemistry 47 ( 6 ): 541 - 548 , 2010