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Machemehl T, Hsu P, Pahad H, Williams P, Yilmaz TH, Vassiliu P, Boffard KD, Degiannis E, Doll D.Machemehl T, et al. Among authors: vassiliu p.S Afr Med J. 2013 Jul 29;103(9):652-7. doi: 10.7196/samj.6768.S Afr Med J. 2013.PMID: 24300686