1. Department of Anesthesiology and Intensive Care, University Hospital Lozenetz, Kozyak Str., 1407 Sofia, Bulgaria
2. Medical Faculty, Sofia University, St. Kliment Ohridski, Kozyak 1 Str., 1407 Sofia, Bulgaria
3. Medical Faculty, Medical University of Sofia, 1 Georgi Sofiiski Str., 1431 Sofia, Bulgaria
4. Clinic of Endocrinology and Metabolic Disorders, University Multiprofil Hospital Active Treatement “Sv. Georgi”, 4000 Plovdiv, Bulgaria
5. Department of Genetics, Faculty of Biology, Sofia University “St. Kliment Ohridski”, 8 Dragan Tzankov Str., 1164 Sofia, Bulgaria
6. Department of General and Clinical Pathology, Medical University of Plovdiv, Bul. Vasil Aprilov 15A, 4000 Plovdiv, Bulgaria
7. Department of Gastroenterology, University Hospital Lozenetz, 1407 Sofia, Bulgaria
8. Department of Diagnostic Imaging, Medical University of Plovdiv, Bul. Vasil Aprilov 15A, 4000 Plovdiv, Bulgaria
9. Department of Epidemiology and Disaster Medicine, Medical University of Plovdiv, University Hospital “St George”, 4000 Plovdiv, Bulgaria
10. Laboratory of Hematopathology and Immunology, National Specialized Hospital for Active Treatment of Hematological Diseases, 1756 Sofia, Bulgaria
11. Department of Informatics, New Bulgarian University, Montevideo 21 Str., 1618 Sofia, Bulgaria
12. Pediatric Clinic, University Hospital “N. I. Pirogov”, 21 “General Eduard I. Totleben” Blvd, 1606 Sofia, Bulgaria
13. Department of Healthcare, Faculty of Public Health “Prof. Tsekomir Vodenicharov, MD, DSc”, Medical University of Sofia, Bialo More 8 Str., 1527 Sofia, Bulgaria
14. Faculty of Public Health and Healthcare, Ruse University Angel Kanchev, 7017 Ruse, Bulgaria