Serum 25-hydroxyvitamin D status of the US population: 1988-1994 compared with 2000-2004.
Looker AC; Pfeiffer CM; Lacher DA; Schleicher RL; Picciano MF; Yetley EA; The American Journal Of Clinical Nutrition, 2008, vol. 88, issue 6, p 1519, ISSN 19383207. ISBN 19383207.

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