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A population-based nested case control study on recurrent pneumonias in children with severe generalized cerebral palsy: ethical considerations of the design and representativeness of the study sample.
Veugelers R, Calis EA, Penning C, Verhagen A, Bernsen R, Bouquet J, Benninga MA, Merkus PJ, Arets HG, Tibboel D, Evenhuis HM. Veugelers R, et al. Among authors: calis ea. BMC Pediatr. 2005 Jul 19;5:25. doi: 10.1186/1471-2431-5-25. BMC Pediatr. 2005. PMID: 16029493 Free PMC article.