1. Department of Internal Medicine, Medical University of Lublin, Lublin, Poland
2. Chair and Department of Ophthalmology, Medical University of Lublin, Lublin, Poland
3. Department of Ethics and Human Philosophy, Medical University of Lublin, Lublin Poland and Department of Nephrology, Medical University of Lublin, Lublin, Poland
4. Department of Ophthalmology, Poznan City Hospital, Poznan, Poland and Department of Ophthalmology, University of Warmia and Mazury, Olsztyn, Poland