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Sischy A, da L'Exposto F, Dangor Y, Fehler HG, Radebe F, Walkden DD, Miller SD, Ballard RC.Sischy A, et al. Among authors: fehler hg.Genitourin Med. 1991 Apr;67(2):129-32. doi: 10.1136/sti.67.2.129.Genitourin Med. 1991.PMID: 2032706Free PMC article.
Ballard RC, Fehler HG.Ballard RC, et al. Among authors: fehler hg.S Afr Med J. 1986 Oct 11;Suppl:76-9.S Afr Med J. 1986.PMID: 3775563No abstract available.