1 Department of Ophthalmology, Poznan City Hospital, Poznan, Poland; Department of Ophthalmology, University of Warmia and Mazury, Olsztyn, Poland.
2 Department of Ethics and Human Philosophy Medical University, Lublin, Poland.
3 Department of Health Informatics and Statistics, Institute of Rural Health, Lublin, Poland; Faculty of Health Sciences, University of Economics and Innovation, Lublin, Poland. Electronic address: wlos131313@gmail.com.