1. Chair and Clinical Department of Ophthalmology, Faculty of Medical Sciences, Zabrze Medical University of Silesia, 40-760 Katowice, Poland
2. Wrocławskie Centrum Okulistyczne, 50-231 Wrocław, Poland
3. Dr. Rofl M. Schwiete Center for Limbal Stem Cell and Aniridia Research, Saarland University, 66424 Homburg, Germany
4. Department of Experimental Ophthalmology, Saarland University, 66424 Homburg, Germany
5. Department of Ophthalmology, District Railway Hospital, 40-760 Katowice, Poland