Analyzing vitamin D in foods and supplements: methodologic challenges.
Byrdwell WC; Devries J; Exler J; Harnly JM; Holden JM; Holick MF; Hollis BW; Horst RL; Lada M; Lemar LE; Patterson KY; Philips KM; Tarrago-Trani MT; Wolf WR; The American Journal Of Clinical Nutrition, 2008, vol. 88, issue 2, p 554S, ISSN 19383207. ISBN 19383207.

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