1. Center for Eye Research Department of Ophthalmology Oslo University Hospital Oslo Norway
2. Department of Paediatrics and adolescent Medicine Akershus University Hospital Lorenskog Norway
3. Institute of Clinical Medicine Faculty of Medicine University of Oslo Oslo Norway
4. Oslo Diabetes Research Centre Oslo Norway
5. Department of Paediatrics Oslo University Hospital Oslo Norway
6. Oslo Centre of Biostatistics and Epidemiology Oslo University Hospital Oslo Norway