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   Xin Lu et al, 2021, Frontiers in Oncology CrossRef
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   Dariimaa Ganbat et al, 2021, Current Cancer Drug Targets CrossRef
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   Mai Ishibashi et al, 2012, Biological and Pharmaceutical Bulletin CrossRef
4. Vitamins and Melanoma
   Irene Russo et al, 2015, Cancers CrossRef