1. Swiss Eye Institute and Clinic for Vitreoretinal Diseases, Berner Augenklinik, Bern, Switzerland.
2. Department of Ophthalmology, Bern University Hospital, Bern, Switzerland.
3. Department of Ophthalmology, University of Lausanne, Jules Gonin Eye Hospital, Lausanne, Switzerland.
4. Swiss Visio Clinic Montchoisi, Lausanne, Switzerland.
5. Department of Ophthalmology, Pallas Kliniken, Olten, Switzerland.
6. Department of Ophthalmology, University Hospital Essen, University Duisburg-Essen, Essen, Germany.
7. Medical Faculty, University of Bern, Bern, Switzerland.
8. Centre Ophtalmologique de la Colline, Hirshlanden Clinics and Clinique d'Ophtalmologie, Hôpitaux Universitaires de Genève, Geneva, Switzerland.