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Vitamin A free resource MedlinePlus Health Information https://medlineplus.gov/vitamina.html
free resource PubMed Central https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/28115667/
free resource Europe PubMed Central https://europepmc.org/abstract/MED/28115667
free resource NCI CPTAC Assay Portal https://assays.cancer.gov/CPTAC-68
free resource scite Smart Citations https://scite.ai/reports/28115667
subscription/membership/fee required Sheridan PubFactory https://ajtmh.org/doi/10.4269/ajtmh.16-0599