Outcome at five years of age in very preterm and very low birthweight infants in the Netherlands : results from the nationwide collaborative follow-up study: Project On Preterm and Small for gestational age infants, POPS 1983 / Martina Hendrika Ens-Dokkum, Anna Martha Schreuder, Sylvia VeenVeel te vroeg en/of veel te licht geboren kinderen in Nederland, uitkomsten op 5 jaar : samenvatting van "Outcome at five years of age in very preterm and very low birthweight infants in the Netherlands", proefschrift Rijksuniversiteit Leiden 1993 / M.H. Ens-Dokkum, A.M. Schreuder, S. Veen