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Determination of serum vitamins 25-OH-D2 and 25-OH-D3 with liquid chromatography-tandem mass spectrometry using atmospheric pressure chemical ionization or electrospray source and core-shell or sub-2 μm particle columns: a comparative study.
Bogusz MJ, Al Enazi E, Tahtamoni M, Jawaad JA, Al Tufail M. Bogusz MJ, et al. Among authors: al enazi e. Clin Biochem. 2011 Nov;44(16):1329-37. doi: 10.1016/j.clinbiochem.2011.08.1134. Epub 2011 Aug 31. Clin Biochem. 2011. PMID: 21907190