Determinations of 25-hydroxyvitamin D2 and 25-hydroxyvitamin D3 in serum by liquid chromatography tandem-mass spectrometry
XU Fengxian, YU Jiaping.
Laboratory Medicine . 2015, (8): 821 -824 .  DOI: 10.3969/j.issn.1673-8640.2015.08.012