The contributors have been recruited from excessive colleges in Greece, Italy and Sweden. The purpose of the research was outlined to the headmaster and class lecturers, who gave their permission. Moreover, in Italy and Greece, parents gave written consent for his or her minor kids, whereas in Sweden the mother and father don’t have to supply their consent when the adolescent is over 15 years previous. Approval to conduct the examine in Italy and in Sweden was obtained, whereas such approval was not necessary in Greece. The collaborating college students have been first knowledgeable of the aim and usefulness of the study and the importance of their participation, they usually acquired relevant directions for finishing the questionnaires of their lecture rooms. College college students accomplished the nameless questionnaire by way of the college classes within the presence of researchers. The completion of questionnaires took roughly forty five minutes.
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