1. Hellenic Centre for Disease Control and Prevention; Athens Greece
2. National Development and Research Institutes (IAS/NIDA Post-Doctoral Research Fellow); New York NY USA
3. Department of Computer Science and Biomedical Informatics; University of Central Greece; Lamia Greece
4. Department of Internal Medicine; Faculty of Nursing; University of Athens; Athens Greece
5. Department of Public Health; Laboratory of Prevention; Faculty of Nursing; University of Athens; Athens Greece
6. Department of Hygiene; Epidemiology and Medical Statistics; Medical School; University of Athens; Athens Greece