1. Department of Hygiene and Epidemiology; University of Ioannina School of Medicine; Ioannina Greece
2. Department of Primary Education; University of Ioannina; Ioannina Greece
3. Department of Public Health and Community Medicine, Section of Psychiatry; University of Verona; Verona Italy
4. Department of Psychiatry; University of Oxford; Oxford U.K.
5. Department of Psychiatry and Psychotherapy; Technische Universität München; Munich Germany
6. Department of Computer Science and Biomedical Informatics; University of Thessaly; Lamia Greece