1. Student Research Club of Surgical Specialties, Faculty of Medicine, Wroclaw Medical University, 50-532 Wrocław, Poland
2. Department of Internal and Occupational Diseases, Hypertension and Clinical Oncology, Wroclaw Medical University, 50-556 Wrocław, Poland
3. Faculty of Medicine, Wrocław University of Science and Technology, 50-376 Wrocław, Poland