Factors affecting the incidence of chronic lung disease of prematurity in 1987, 1992, and 1997. - Manktelow BN; Draper ES; Annamalai S; Field D; Manktelow, B N; Draper, E S; Annamalai, S; Field, D (Archives of Disease in Childhood -- Fetal & Neonatal Edition, 2001)