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Pieters M, Swanepoel AC.Pieters M, et al. Among authors: swanepoel ac.Pol Arch Intern Med. 2021 Oct 27;131(10):16123. doi: 10.20452/pamw.16123. Epub 2021 Oct 27.Pol Arch Intern Med. 2021.PMID: 34704706Free article.Review.