1. Faculty of Public Health, Department of Health Policy and Management, Medical University of Sofia, Sofia, Bulgaria
2. Faculty of Pharmacy, Department of Pharmaceutical Sciences, Medical University of Plovdiv, Plodiv, Bulgaria
3. Faculty of Pharmacy, Department of Pharmaceutical Sciences and Social Pharmacy, Medical University of Pleven, Pleven, Bulgaria
4. Faculty of Public Health, Department of Health Care Management, Medical University of Plovdiv, Plovdiv, Bulgaria