1. Diagnostic endoscopic ultrasound in malignant pathology of the hepatobiliary system and pancreas (A.Katzarov, Z. Dunkov, M. Simonova, D. Stoyanova, D. Tomova, M. Konakchieva, R. Gledjarska, I Popadiin, A. Petkov, K. Katzarov)
2. Minimally invasive percutaneous nephrolithotomy for management of impacted proximal ureteral stones (O. Gatsev, S. Hristoforov, P. Petrov, K. Petkova, I. Saltirov)
3. Comparative study of retrograde intrarenal surgery with single-use and reusable flexible ureteroscope (K. Petkova, I. Saltirov)
4. Retrograde Intrarenal Surgery (RIRS): Dusting and spontaneous elimination of fragmentation and active basket extraction. (P. Petrov, S. Hristoforov, O. Gаtsev, K. Petkova, I. Saltirov)
5. Comparative study: effectiveness and safeness of systematic TRUS guided biopsy and transperineal magnetic resonance imaging/ ultrasound-guided prostate biopsy (S. Hristoforov, P. Petrov, O. Gatsev, K. Petkova, I. Saltirov)
6. Percutaneous injection of autogenous bone marrow for delayed union or non-union. (B. Zlatev, B. Kurktchiev, R Zlatev, N. Tzachev)
7. Unilateral spinal anesthesia for knee arthroscopy – a comparative study between 6 mg hypobaric and 6 mg hyperbaric Bupivacaine (V. Dimov, E. Odiseeva, V. Dimitrov, V.Stefanov, V. Rusimov, N. Petrov)
8. Refractive results after cataract surgery in patients calculated by the Holladay II formula. (Т. Kirova, A. Kalaidzhiev, L. Voynov)
9. Bleeding after performing retrograde cholangiopancreatography (ERCP) Singe center experience in over 600 cases (A. Katzarov, E Naseva)
10. Colonic perforation as a complication of percutaneous nephrolithotomy for staghorn kidney stone (K. Petkova, Ts. Lukanova, O. Gatsev, I. Ivanov, I. Saltirov)
11. Transperitoneal laparoscopic deroofing for management of symptomatic simple renal cysts (I.Takorov, S. Simeonovski, O. Gatsev, D. Valtsheva, I. Saltirov)