Differential impact of simple childhood obesity on the components of the growth hormone-insulin-like growth factor (IGF)-IGF binding proteins axis - Ballerini, M G; Ropelato, M G; Domené, H M; Pennisi, P; Heinrich, J J; Jasper, H G (Journal of Pediatric Endocrinology and Metabolism J Pediatr Endocr Met, 2004)