Duration of periventricular densities: Significance for neurological status and motor competence in preterm infants at six years : M. Jongmansa, S. Hendersona, L. de Vriesb and L. Dubowitzc. aDepartment of Educational Psychology and Special, Educational Needs, Institute of Education, University of London (UK), bWilhelmina Children's Hospital, Department of Neonatology, Utrecht (Netherlands) and cDepartment of Paediatrics and Neonatal Medicine, Royal Post-graduate Medical School, Hammersmith Hospital, London (UK).