1. From the Centre for Paediatric Epidemiology, Institute of Child Health, London, United Kingdom; the2Department of Ophthalmology and Visual Sciences Unit, Great Ormond Street Hospital, London, United Kingdom; and the
2. From the Centre for Paediatric Epidemiology, Institute of Child Health, London, United Kingdom; the
3. From the Centre for Paediatric Epidemiology, Institute of Child Health, London, United Kingdom; the2Department of Ophthalmology and Visual Sciences Unit, Great Ormond Street Hospital, London, United Kingdom; and the3Division of Epidemiology, Institute of