Fig. 1From: Respiratory morbidity through the first decade of life in a national cohort of children born extremely pretermDescription of the Nationwide Cohort of Children Born in Norway During 1999 and 2000 at a Gestational Age <28 Weeks or with a Birth Weight <1000 Grams. Abbreviations: GA – Gestational Age, BW – Birth Weight, NICU – Neonatal Intensive Care UnitBack to article page