1. Department of Pharmacognosy and Pharmaceutical Chemistry, Faculty of Pharmacy, Medical University-Plovdiv, 4002 Plovdiv, Bulgaria
2. Research Institute, Medical University-Plovdiv, 4002 Plovdiv, Bulgaria
3. Department of Propedeutics of Surgical Diseases, Section of General Surgery, Faculty of Medicine, Medical University-Plovdiv, 4002 Plovdiv, Bulgaria
4. Department of Propedeutics of Internal Diseases, Medical Faculty, Medical University-Plovdiv, 4002 Plovdiv, Bulgaria