1. Organization Against Drugs, Athens, Greece; Nursing Department, University of Peloponnese, Panarcadian Hospital Erythrou, Tripoli, Greece
2. Organization Against Drugs, Athens, Greece
3. Department of Computer science and Biomedical Informatics, University of Thessaly, Lamia, Greece
4. Department of Nutrition and Dietetics, University of Thessaly, Trikala, Greece
5. Nursing Department, University of Peloponnese, Panarcadian Hospital Erythrou, Tripoli, Greece