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Dommisse J, Commerford PJ, Levetan B.Dommisse J, et al. Among authors: levetan b.S Afr Med J. 1996 Sep;86(9 Suppl):1194-6.S Afr Med J. 1996.PMID: 9180783
Von Oppell UO, Stemmet F, Levetan B, Heijke SA, Brink J.Von Oppell UO, et al. Among authors: levetan b.Cardiovasc J S Afr. 2001 Jun-Jul;12(3):152-8.Cardiovasc J S Afr. 2001.PMID: 11533737