Pure predictive validity of the Bayley Scales of Infant Development for cognitive function of extremely low birth weight children at school age. - Hack,M.; Taylor,HG.; Drotar,D.; Schluchter,M.; Cartar,L.; Wilson-Costello,D.; Klein,N.; Friedman,H.; Mercuri-Minich,N.; Morrow,M. (Pedicatrics, 2005)