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Schoeman JF, Van Zyl LE, Laubscher JA, Donald PR.Schoeman JF, et al. Among authors: van zyl le.Pediatrics. 1997 Feb;99(2):226-31. doi: 10.1542/peds.99.2.226.Pediatrics. 1997.PMID: 9024451Clinical Trial.
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Cotton MF, Donald PR, Schoeman JF, Aalbers C, Van Zyl LE, Lombard C.Cotton MF, et al. Among authors: van zyl le.Pediatr Infect Dis J. 1991 Nov;10(11):837-42. doi: 10.1097/00006454-199111000-00009.Pediatr Infect Dis J. 1991.PMID: 1844394
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