1. 1Department ”Hygiene, Medical Ecology and Nutrition”, Medical University, Medical Faculty, 15 Blvd “Acad. Ivan Evstr. Geshov”, 1431, Sofia, Bulgaria
2. 2Department “Oral and Image Diagnostic”, Medical University, Faculty of Dental Medicine, 1 Blvd “St G. Sofiiski”, 1431, Sofia, Bulgaria
3. 3Institute for legal studies, Bulgarian Academy of Sciences, 4 “Serdica” str, 1000, Sofia, Bulgaria