1. Department of Ophthalmology University Medical Center of the Johannes Gutenberg University Mainz Mainz Germany
2. Division of Neonatology, Department of Pediatrics University Medical Center of the Johannes Gutenberg University Mainz Mainz Germany
3. Division of Pediatric Epidemiology, Institute for Medical Biostatistics, Epidemiology and Informatics University Medical Center of the Johannes Gutenberg University Mainz Mainz Germany
4. Department of Ophthalmology University Hospital Leipzig Leipzig Germany