1. Department of Special Surgery, Medical Faculty, Medical University of Plovdiv, 4001 Plovdiv, Bulgaria
2. Department of Surgery, University Hospital “Kaspela”, 4001 Plovdiv, Bulgaria
3. Department of Urology and General Medicine, Medical Faculty, Medical University of Plovdiv, 4001 Plodiv, Bulgaria
4. Department of Urology, University Hospital “Kaspela”, 4001 Plovdiv, Bulgaria
5. Department of Endocrinology, Medical Faculty, Medical University of Plovdiv, 4001 Plovdiv, Bulgaria
6. Department of Endocrinology, University Hospital “Kaspela”, 4001 Plovdiv, Bulgaria
7. Department of Health Management and Health Economics, Faculty of Public Health, Medical University of Plovdiv, 4001 Plovdiv, Bulgaria
8. Second Department of Internal Diseases, Section of Gastroenterology, Medical Faculty, Medical University of Plovdiv, 4001 Plovdiv, Bulgaria
9. Department of Gastroenterology, University Hospital “Kaspela”, 4001 Plovdiv, Bulgaria