al conisol levels at 3. 6, 8 and 18 months in infants born at extremely low gestational age. J. Pediatr. 2007;150(2):151-156. 57. Gnmau RE, Tu MT, Whitfield MF, et al. Cortisol. behavior, and heart rate reactivity to immunization pain at 4 months corrected age in infants born very pretenn. Clin J Pain. 201

gnitive and behavioral outcomes of school-aged children who were born pretenn: a meta-analysis. JAMA. 2002;288(6):728-737. 26. Grunau RE, Haley DW. Whitfield MF, et al. Altered basal cortisol levels at 3, 6, 8 and 18 months in infants born at extremely low gestational age. J Pediatr. 2007;150(2):151-156. 2