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Schaaf HS, Beyers N, Gie RP, Nel ED, Smuts NA, Scøtt FE, Donald PR, Fourie PB.Schaaf HS, et al. Among authors: donald pr.Pediatr Infect Dis J. 1995 Mar;14(3):189-94.Pediatr Infect Dis J. 1995.PMID: 7761183
Smuts NA, Beyers N, Gie RP, Schaaf HS, Talent JM, Nel E, van Zyl S, Donald PR.Smuts NA, et al. Among authors: donald pr.Pediatr Radiol. 1994;24(7):478-80. doi: 10.1007/BF02015003.Pediatr Radiol. 1994.PMID: 7885777Clinical Trial.