1. Clinic of Gastroneterology, Nephrourology and Abdominal Surgery, Institute of Clinical Medicine, Faculty of Medicine, Vilnius University, Vilnius, Lithuania;
2. Faculty of Medicine, Vilnius University, Vilnius, Lithuania;
3. Centre of Nephrology, Vilnius University Hospital Santaros Clinics, Vilnius, Lithuania;
4. Centre of Radiology and Nuclear Medicine, Vilnius University Hospital Santaros Clinics, Vilnius, Lithuania