1. First Department of Ophthalmology, National and Kapodistrian University of Athens, General Hospital “G. Gennimatas”, Athens, Greece
2. Department of Ophthalmology, Philipps University, Marburg, Germany
3. State Ophthalmology Clinic, General Hospital “G. Gennimatas”, Athens, Greece
4. Jules Gonin Eye Hospital, Faculty of Biology and Medicine, University of Lausanne, Lausanne, Switzerland