1. Cantonal Hospital of St. Gallen, Department of Ophthalmology, St. Gallen, Switzerland (Chair: PD Dr. Christophe Valmaggia)
2. Cantonal Hospital of Aarau, Department of Ophthalmology, Aarau, Switzerland (Chair: Prof. Hanspeter E. Killer)
3. University Hospital Zurich, Department of Ophthalmology, Zurich, Switzerland (Chair: Prof. Klara Landau)