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El Far M, El Naggar M, Elkhawaga OA, Yahya R, Allam A, Khalifa A. Carcinoembryonic antigen, alpha-fetoprotein, and prostate-specific antigen in the sera of industrial workers exposed to phenol, formaldehyde, urea, and mixed vapors. Inhal Toxicol. 2006 Dec;18(13):1041–6. doi: 10.1080/08958370600904603. PMID: 16966304. |