1. From the Department of Ophthalmology, General Hospital Klagenfurt, Klagenfurt, Austria;
2. Department of Ophthalmology, Medical University Graz, Graz, Austria;
3. Office for Biostatistics, Centre for Medical Research, and
4. Department of Transfusion Medicine and Blood Serology, Medical University Graz, Graz, Austria.
5. From the Department of Ophthalmology, General Hospital Klagenfurt, Klagenfurt, Austria; 2Department of Ophthalmology, Medical University Graz, Graz, Austria;