Aristotle University of Thessaloniki is the largest university in Greece and in Balkans. The main campus is located in the center of the city of Thessaloniki, and covers an area of about 33.4 hectares. It comprises 7 faculties which consist of 33 schools, 5 faculties which consist of one school each, as well as 4 independent schools. Some educational and administrative facilities are located off campus for practical and operational reasons. A number of these facilities are located outside the city of Thessaloniki or even in other cities. About 81,500 students study at the Aristotle University (72,140 in undergraduate programs and 8,360 in postgraduate programs). There are 2,150 faculty members: 739 professors, 435 associate professors, 634 assistant professors, and 342 lecturers. There are also 11 teaching assistants, 58 research fellows, 248 members of the Special Laboratory Teaching Personnel (S.L.T.P.), 69 of whom belong to category Ι and 179 to category ΙΙ, as well as 15 foreign language teachers and 4 foreign instructors. Faculty members are also assisted by 213 members of the Special Technical Laboratory Personnel (S.T.L.P.). The administration office consists of 400 permanent employees and 528 employees under a private law contract of indefinite duration. Moreover, 596 people employed by third parties provide services at the university. The Aristotle University has a strong commitment in research and getting EU funding. Indicatively, in this financial year the Aristotle University of Thessaloniki participates in 10 EU funded projects, whereas there have been already submitted 19 proposals for funding by the EU. The Department of Physical Education and Sport Sciences (DPESS) was founded in 1982 and since then has participated in various research projects funded by national and international agencies. Towards advancing research on the field, the Department covers postgraduate studies at master, doctoral, and post-doctoral level. In terms of facilities, the Department occupies a modern complex of buildings, specifically designed for teaching and research in sport psychology and motor behavior. There are extensive facilities including a suite of rooms designed for research in sport psychology and motor behavior; a number of light-proof and sound-proof rooms; audio and video edit rooms. For teaching purposes there is a lecture theatre, seven teaching rooms and nine teaching laboratories. The DPESS focuses on the promotion of active and healthy lifestyle throughout the lifespan. The DPESS specializes in: a) the social-psychological study of substance use, exercise participation, and lifestyle change across the lifespan, and b) the design and application of health promotion and behavior change interventions. In relation to the proposed project, the principal investigator as staff member of the DPESS has successfully completed 6 projects funded by the World Anti-Doping Agency on the use of doping and nutritional supplements by adolescent and adult athletes, and participates as national coordinator in 10 ongoing multi-national projects on the risk and protective factors of doping use in adolescents and young adults. The DPESS and the national coordinator maintain collaboration with national and regional public policy and education authorities for the prevention of doping and substance use in sports and other settings.