Supplementation with vitamins C, E, beta-carotene and selenium has no effect on anti-oxidant status and immune responses in allergic adults: a randomized controlled trial - Dunstan, J A; Breckler, L; Hale, J; Lehmann, H; Franklin, P; Lyons, G; Ching, S Y; Mori, T A; Barden, A; Prescott, S L (Clin Exp Allergy, 2007)