Correlates of serum lutein + zeaxanthin: findings from the Third National Health and Nutrition Examination Survey.
Gruber M, Chappell R, Millen A, LaRowe T, Moeller SM, Iannaccone A, Kritchevsky SB, Mares J. Correlates of serum lutein + zeaxanthin: findings from the Third National Health and Nutrition Examination Survey. J Nutr. 2004 Sep; 134(9):2387-94.