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Tanumihardjo, SA (2002). "Factors influencing the conversion of carotenoids to retinol: bioavailability to bioconversion to bioefficacy". Int J Vit Nutr Res72 (1): 40–5. PMID11887751. doi:10.1024/0300-9831.72.1.40.
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Tanvetyanon T, Bepler G (2008). "Beta-carotene in multivitamins and the possible risk of lung cancer among smokers versus former smokers: a meta-analysis and evaluation of national brands". Cancer113 (1): 150–7. PMID18429004. doi:10.1002/cncr.23527.