1. Swiss Eye Institute and Clinic for Vitreoretinal Diseases, Berner Augenklinik, Bern, Switzerland.
2. Department of Ophthalmology, Bern University Hospital, Bern, Switzerland.
3. Cabinet Mantel, Chemin de Pré-Fleuri 6, 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.