Determination of reference values for serum folate and vitamin B12 using three different immunoassays: Is it worth making an effort to produce them in our laboratory?

1. Ajuria-Morentin, I.
2. Mar-Medina, C.
3. Bereciartua-Urbieta, E.
4. Aguirre-Larracoechea, U.
5. Quintana-LÓPEZ, J.M.
6. Ruiz-Larrea, M.B.