1. Department of Ophthalmology, Bern University Hospital, Inselspital, University of Bern, Bern, Switzerland
2. Berner Augenklinik am Lindenhofspital, Bern, Switzerland
3. Department of Ophthalmology, University Hospital Zurich, University of Zurich, Zurich, Switzerland
4. Eye Hospital, FAA, Department of Ophthalmology, University of LausanneJules-Gonin, Lausanne, Switzerland
5. Department of Ophthalmology, University of Basel, Basel, Switzerland
6. Pallas Klinik, Olten, Switzerland
7. Department of Ophthalmology, University Hospital Essen, University Duisburg-Essen, Essen, Germany
8. University of Bern, Bern, Switzerland