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Wald ER, Mason EO Jr, Bradley JS, Barson WJ, Kaplan SL; US Pediatric Multicenter Pneumococcal Surveillance Group.Wald ER, et al. Among authors: kaplan sl.Pediatr Infect Dis J. 2001 Jan;20(1):34-9. doi: 10.1097/00006454-200101000-00007.Pediatr Infect Dis J. 2001.PMID: 11176564