Measuring health-related quality of life in children with ESRD: performance of the generic and ESRD-specific instrument of the Pediatric Quality of Life Inventory (PedsQL). - Goldstein SL; Graham N; Warady BA; Seikaly M; McDonald R; Burwinkle TM; Limbers CA; Varni JW (American journal of kidney diseases : the official journal of the National Kidney Foundation, 2008)