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Vander Wal E, van Beest FM, Brook RK.Vander Wal E, et al. Among authors: van beest fm.PLoS One. 2013;8(1):e53777. doi: 10.1371/journal.pone.0053777. Epub 2013 Jan 9.PLoS One. 2013.PMID: 23326502Free PMC article.
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