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Vitamin A and cancer prevention II: comparison of the effects of retinol and beta-carotene.
de Klerk NH, Musk AW, Ambrosini GL, Eccles JL, Hansen J, Olsen N, Watts VL, Lund HG, Pang SC, Beilby J, Hobbs MS. de Klerk NH, et al. Among authors: ambrosini gl. Int J Cancer. 1998 Jan 30;75(3):362-7. doi: 10.1002/(sici)1097-0215(19980130)75:3<362::aid-ijc6>3.0.co;2-0. Int J Cancer. 1998. PMID: 9455794 Free article. Clinical Trial.
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