1. Department of Ophthalmology, Medical University Graz, Auenbruggerplatz 4, 8036 Graz, Austria
2. Department of Ophthalmology, General Hospital Klagenfurt, St. Veiter Strasse 47, 9020 Klagenfurt, Austria
3. Clinical Institute of Medical and Chemical Laboratory Diagnostics, Medical University Graz, Auenbruggerplatz 15, 8036 Graz, Austria