1. Department of Medical Informatics, Biostatistics and E-Learning, Medical University of Plovdiv, 4002 Plovdiv, Bulgaria
2. Department of Health Management and Health Economics, Medical University of Plovdiv, 4002 Plovdiv, Bulgaria
3. Department of Hygiene, Medical University of Plovdiv, 4002 Plovdiv, Bulgaria
4. Department of Forensic Medicine and Deontology, Medical University of Plovdiv, 4002 Plovdiv, Bulgaria