Longitudinal, 15-year follow-up of children born at less than 29 weeks' gestation after introduction of surfactant therapy into a region: neurologic, cognitive, and educational outcomes.
D'Angio CT, Sinkin RA, Stevens TP, Landfish NK, Merzbach JL, Ryan RM, Phelps DL, Palumbo DR, Myers GJ. Pediatrics. 2002 Dec; 110(6):1094-102.