TY - JOUR AU - Tai, S S; Bedner, M; Phinney, K W TI - Development of a candidate reference measurement procedure for the determination of 25-hydroxyvitamin D3 and 25-hydroxyvitamin D2 in human serum using isotope-dilution liquid chromatography-tandem mass spectrometry JO - Anal Chem VL - 82 PY - 2010 DO - 10.1021/ac9026862 SP - 1942 EP - 1948 ER -