1. Department of General Ophthalmology, Medical University, 20-079 Lublin, Poland
2. Department of Ophthalmology, University of Heidelberg, 69120 Heidelberg, Germany
3. Human Anatomy Department, Medical University, 20-090 Lublin, Poland
4. Department of Experimental Pharmacology, Medical Research Centre, Polish Academy of Sciences, 02-069 Warsaw, Poland