1. Clinic of Endocrinology; University Hospital “Alexandrovska”, Medical University-Sofia; Sofia Bulgaria
2. Central Clinical Laboratory; University Hospital “Alexandrovska”, Medical University-Sofia; Sofia Bulgaria
3. Clinic of Neurology; University Hospital “Alexandrovska”, Medical University-Sofia; Sofia Bulgaria
4. Department of Pathology; University Hospital “Alexandrovska”, Medical University-Sofia; Sofia Bulgaria
5. General and Hepato-Pancreatic Surgery Clinic; University Hospital “Alexandrovska”, Medical University-Sofia; Sofia Bulgaria
6. Department of Diagnostic Medicine; University Hospital “Alexandrovska”, Medical University-Sofia; Sofia Bulgaria