1. Department of Ophthalmology, Cantonal Hospital of Lucerne, Lucerne, Switzerland
2. Berner Augenklinik, Bern, Switzerland
3. Department of Ophthalmology, Bern University Hospital, Inselspital, University of Bern, Bern, Switzerland
4. Department of Ophthalmology, Pallas Klink, Olten, Switzerland
5. Department of Ophthalmology University Hospital Zurich, University of Zurich, Zurich, Switzerland
6. Eye Hospital, FAA, Department of Ophthalmology, University of Lausanne Jules-Gonin, Lausanne, Switzerland
7. Department of Ophthalmology, University of Basel, Basel, Switzerland
8. Augenarztpraxis Bremgarten, Bremgarten, Switzerland
9. Department of Ophthalmology, University Hospital Essen, University Duisburg-Essen, Essen, Germany
10. Department of Ophthalmology, San Raffaele Scientific Institute, University Vita-Salute, Milan, Italy
11. Medical Faculty, University of Bern, Bern, Switzerland