1. Swiss Eye Institute, Berner Augenklinik am Lindenhofspital, Bern, Switzerland.
2. Department of Ophthalmology, Inselspital, Bern University Hospital, University of Bern, Bern, Switzerland.
3. Stadtspital Triemli, Zurich, Switzerland.
4. HFR Kantonsspital, Freiburg, Switzerland.
5. Department of Ophthalmology, Jules Gonin Eye Hospital, University of Lausanne, Lausanne, Switzerland.
6. Eye Clinic Zurich West, Zurich, Switzerland.
7. University of Zurich, Zurich, Switzerland.