1. Department of Ophthalmology at St Franziskus Hospital, University of Duisburg-Essen, Münster
2. German Rheumatism Research Center, a Leibniz Institute, Berlin
3. Institute for Social Medicine, Epidemiology and Health Economics, Charité – University Medicine Berlin, Berlin, Germany
4. Department of Ophthalmology, Inselspital, Bern University Hospital, University of Bern, Bern, Switzerland
5. Ophthalmology, Bonn
6. Department of Paediatric Rheumatology and Immunology, University of Muenster, Münster
7. Department of Rheumatology and Clinical Immunology Charité – University Medicine Berlin, Berlin, Germany