1. Clinic of Endocrinology, University Hospital Alexandrovska, Department of Internal Medicine, Medical University-Sofia, Sofia, Bulgaria
2. Clinic of Cardiology, National Heart Hospital, Sofia, Bulgaria
3. Clinic of Septic Surgery, UMBALSM N I Pirogov EAD, Sofia, Bulgaria
4. Department of Clinical Immunology, Lozenetz Hospital, Sofia, Bulgaria
5. Clinic of Cardiology, University Hospital Alexandrovska, Department of Internal Medicine, Medical University-Sofia, Sofia, Bulgaria