1. Department of Oncological Surgery, Prof. Kornel Gibiński, Independent Public Central Clinical Hospital, Medical University of Silesia in Katowice, Katowice, Poland
2. Division of Quality Services, Procedures and Medical Standards, Medical University in Łódź, Łódź, Poland
3. Department of Social Insurance, Warsaw School of Economics, Warsaw, Poland
4. Department of Analysis and Strategy, Ministry of Health, Warsaw, Poland
5. Academic and Clinical Department of General Surgery, Faculty of Medicine with the Division of Dentistry in Zabrze, Medical University of Silesia, Zabrze, Poland