Authors
Department of Nephrology, Hematology, and Gastroenterology, Faculty of Medicine, Medical University – Pleven, Bulgaria
Clinic of Gastroenterology, University Hospital „Georgi Stranski“ – Pleven, Bulgaria
B. Zhelezarova
Department of Cardiology, Pulmonology, Endocrinology and Rheumatology, Faculty of Medicine, Medical University – Pleven, Bulgaria
Clinic of Rheumatology, University Hospital „Georgi Stranski“ – Pleven, Bulgaria