1. Specialized Hospital for Active Treatment of Infectious and Parasitic Diseases, Sofia, Bulgaria Blvd. “Akademik Ivan Evstratiev Geshov” 17, 1431 Sofia, Bulgaria
2. Faculty of Medicine, Trakia University, 11 Armeyska Str., 6000 Stara Zagora, Bulgaria
3. Department of Genetics, Faculty of Biology, Sofia University “St. Kliment Ohridski”, 8 Dragan Tzankov Str., 1164 Sofia, Bulgaria
4. Department of Gastroenterology, University Hospital Lozenetz, 1407 Sofia, Bulgaria
5. Medical Faculty, Sofia University “St. Kliment Ohridski”, 1 Kozyak Str., 1407 Sofia, Bulgaria
6. Department of Epidemiology and Disaster Medicine, University Hospital “St. George”, Medical University, 6000 Plovdiv, Bulgaria
7. Clinic of Internal Diseases, Naval Hospital–Varna, Military Medical Academy, Medical Faculty, Medical University, 9000 Varna, Bulgaria
8. Clinic of Endocrinology and Metabolic Disorders, UMHAT “Sv. Georgi”, 4000 Plovdiv, Bulgaria
9. Laboratory of Hematopathology and Immunology, National Specialized Hospital for Active Treatment of Hematological Diseases, 1756 Sofia, Bulgaria
10. Department of Anesthesiology and Intensive Care, University Hospital Lozenetz, 1 Kozyak Str., 1407 Sofia, Bulgaria
11. Pediatric Department, University Hospital “N. I. Pirogov”, 21 “General Eduard I. Totleben” Blvd., 1606 Sofia, Bulgaria
12. Department of Healthcare, Faculty of Public Health, Medical University of Sofia, Bialo more 8 Str., 1527 Sofia, Bulgaria
13. Department of General and Clinical Pathology, Medical University of Plovdiv, Bul. Vasil Aprilov 15A, 4000 Plovdiv, Bulgaria
14. Department of Informatics, New Bulgarian University, Montevideo 21 Str., 1618 Sofia, Bulgaria