1. Division of Neonatology Department of Women's and Children's Health University of Leipzig Medical Center Leipzig Germany
2. Department of Pediatrics University Hospital of Würzburg Würzburg Germany
3. Department of Public Health and Community Medicine Tufts University School of Medicine Boston Massachusetts USA
4. Department of Pediatrics University Hospital of Schleswig‐Holstein, Campus Lübeck Lübeck Germany
5. Department of Ophthalmology University Medicine Greifswald Greifswald Germany