1. Clinic of Anaesthesiology and Intensive Care Medicine, East Slovak Institute of Cardiovascular Disease, Košice, Slovak Republic
2. Poliklinika Terasa, EuroPainClinics, Košice, Slovak Republic
3. Department of Biomedical Engineering and Measurement, Faculty of Mechanical Engineering, Technical University of Košice, Slovak Republic
4. Department of Angiology, East Slovak Institute of Cardiovascular Disease, Košice, Slovak Republic
5. Clinic of Anaesthesiology and Intensive Care Medicine, Railway Hospital and Clinic Košice, Slovak Republic
6. EuroPainClinics, Košice, Slovak Republic
7. Pain Clinic, Faculty Hospital A. D. Roosevelt Banská Bystrica, Slovak Republic
8. Department of Medical and Clinical Biochemistry, Faculty of Medicine, Pavol Jozef Šafárik University, Košice, Slovak Republic