Retinol, alpha-tocopherol, lutein/zeaxantin, beta-cryptoxanthin, lycobene, alpha-carotene, trans-beta-carotene and four retinylesters in serum determined simultaneously by reversed-phase HPLC with multiwavelengh detection. - Sowell,A.L.; Huff,D.L.; Yeager,P.R.; Caudill,S.P.; Gunter,E.W. (Clin Chem, 1994)