1. Chair, Clinical Department of Ophthalmology, Faculty of Medical Sciences in Zabrze , Medical University of Silesia in Katowice , Poland
2. Ophthalmology Department, Railway Hospital in Katowice , Poland
3. Cornea Center of Excellence, Schepens Eye Research Institute, Harvard Medical School , Boston , MA , United States ; Massachusetts Eye and Ear Infirmary, Harvard Medical School , Boston , MA , United States ; Department of Ophthalmology, Harvard Medical School , Boston , MA , United States .