1. Department of Genetics, Faculty of Biology, Sofia University “St. Kliment Ohridski”, 8 Dragan Tzankov str., 1164 Sofia, Bulgaria
2. Department of Epidemiology and Disaster Medicine, University Hospital “Saint George”, Medical University, 6000 Plovdiv, Bulgaria
3. Pediatric Department, University Hospital “N. I. Pirogov,” 21 “General Eduard I. Totleben” Blvd, 1606 Sofia, Bulgaria
4. Department of Healthcare, Faculty of Public Health “Prof. Tsekomir Vodenicharov, MD, DSc”, Medical University of Sofia, Bialo More 8 str., 1527 Sofia, Bulgaria
5. Department of Diagnostic Imaging, Medical University Plovdiv, Bul. Vasil Aprilov 15A, 4000 Plovdiv, Bulgaria
6. Department of Gastroenterology, University Hospital Lozenetz, 1407 Sofia, Bulgaria
7. Medical Faculty, Sofia University St. Kliment Ohridski, 1407 Sofia, Bulgaria
8. Department of Anesthesiology and Intensive Care, University Hospital Lozenetz, 1 Kozyak str., 1407 Sofia, Bulgaria
9. Department of General and Clinical Pathology, Medical University of Plovdiv, Bul. Vasil Aprilov 15A, 4000 Plovdiv, Bulgaria
10. Clinic of Endocrinology and Metabolic Disorders, UMHAT “Sv. Georgi”, 4000 Plovdiv, Bulgaria
11. Department of Informatics, New Bulgarian University, Montevideo 21 str., 1618 Sofia, Bulgaria