References
- Stahelin H B, Gey F, Brubacher G. Preventive potential of antioxidative vitamins and carotenoids on cancer (review). Int J Vitam Nutr Res Suppl 1989; 30: 232–241.
- Eichholzer M, Stahelin H B, Gey K F. Inverse correlation between essential antioxidants in plasma and subsequent risk to develop cancer, ischemic heart disease and stroke respectively: 12-year follow-up of the Prospective Basel Study. EXS 1992; 62: 398–410.
- Wald N J, Thompson S G, Densem J W, Boreham J, Bailey A. Serum vitamin E and subsequent risk of cancer. Br J Cancer 1987; 56: 69–72.
- Willet W C, Polk B F, Underwood B A et al. Relation of serum vitamins A and E and carotenoids to the risk of cancer. New Engl J Med 1984; 310: 430–434.
- Tangney C C, Shekelle R B, Raynor W. Intra- and interindividual variation in measurements of beta carotene, retinol, and tocopherols in diet and plasma. Am J Clin Nutr 1987; 45: 764–769.
- Gallagher S K, Johnson L K, Milne D B. Short- and long-term variability of selected indices related to nutritional status. II. Vitamins, lipids, and protein indices. Clin Chem 1992; 38: 1449–1453.
- Fraser C G, Harris E K. Generation and application of data on biological variation in clinical chemistry. Crit Revs Clin Lab Sci 1989; 27: 409–437.
- Baker J K, Kapeghian J, Verlangieki A. Determination of ascorbic acid and dehydroascorbic acid in blood plasma samples. J Liquid Chromatog 1983; 6: 1319–1332.
- Catignani G L, Bieri J G. Simultaneous determination of α-tocopherol in serum or plasma by liquid chromatography. Clin Chem 1983; 29: 708–712.