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van Walbeek C, Blecher E, van Graan M.van Walbeek C, et al. Among authors: blecher e.S Afr Med J. 2007 Mar;97(3):208-11.S Afr Med J. 2007.PMID: 17440671
Blecher E, Liber A, Van Walbeek C, Rossouw L.Blecher E, et al.PLoS One. 2018 Dec 17;13(12):e0208831. doi: 10.1371/journal.pone.0208831. eCollection 2018.PLoS One. 2018.PMID: 30557353Free PMC article.