Higher baseline serum concentrations of vitamin E are associated with lower total and cause-specific mortality in the Alpha-Tocopherol.
Wright ME, Lawson KA, Weinstein SJ, Pietinen P, Taylor PR, Virtamo J, Albanes D. Beta-Carotene Cancer Prevention Study. Am J Clin Nutr. 2006 Nov;84(5):959-60. 

Serum vitamin A concentrations in asthmatic children in Japan.
Mizuno Y, Furusho T, Yoshida A, Nakamura H, Matsuura T, Eto Y. Pediatr Int. 2006 Jun;48(3):261-4.

Supplementation with vitamins C and E improves arterial stiffness and endothelial function in essential hypertensive patients.
Plantinga Y, Ghiadoni L, Magagna A, Giannarelli C, Franzoni F, Taddei S, Salvetti A. Am J Hypertens. 2007 Apr;20(4):392-7.

Associations between body mass index and the prevalence of low micronutrient levels among US adults.
Kimmons JE, Blanck HM, Tohill BC, Zhang J, Khan LK. MedGenMed. 2006 Dec 19;8(4):59.

Vitamin and trace mineral levels after laparoscopic gastric bypass.
Madan AK, Orth WS, Tichansky DS, Ternovits CA. Obes Surg. 2006 May;16(5):603-6.

Antioxidants and other nutrients do not interfere with chemotherapy or radiation therapy and can increase kill and increase survival, Part 2.
Simone CB, Simone NL, Simone V, Simone CB. Altern Ther Health Med. 2007 Mar-Apr;13(2):40-7.

Vitamin A, retinol, and carotenoids and the risk of gastric cancer: a prospective cohort study.
Larsson SC, Bergkvist L, Näslund I, Rutegård J, Wolk A. Am J Clin Nutr. 2007 Feb;85(2):497-503.

Serum retinoids and beta-carotene as predictors of hip and other fractures in elderly women.
Barker ME, McCloskey E, Saha S, Gossiel F, Charlesworth D, Powers HJ, Blumsohn A. J Bone Miner Res. 2005 Jun;20(6):913-20. Epub 2005 Jan 24

Beta-Carotene: The Controversy Continues.
Patrick L. Alternative Medicine Review, Volume 5 Number 6, 2000.