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Ekpenyong CE, Asuquo AE.Ekpenyong CE, et al.Int J Occup Med Environ Health. 2017 Feb 21;30(1):1-26. doi: 10.13075/ijomeh.1896.00800. Epub 2017 Feb 1.Int J Occup Med Environ Health. 2017.PMID: 28220904Free article.Review.