Increased survival and deteriorating developmental outcome in 23 to 25 week old gestation infants, 1990-4 compared with 1984-9. - Emsley,H.C.; Wardle,S.P.; Sims,D.G.; Chiswick,M.L.; D'Souza,S.W. (Arch Dis Child Fetal Neonatal Ed, 1998)