Psychosocial determinants and perceived environmental barriers as mediators of the effectiveness of a web-based tailored intervention promoting physical activity in adolescents: The HELENA Activ-O-Meter

1. Cook, T.L.
2. De Bourdeaudhuij, I.
3. Maes, L.
4. Haerens, L.
5. Grammatikaki, E.
6. Widhalm, K.
7. Kwak, L.
8. Plada, M.
9. Moreno, L.A.
10. Tountas, Y.
11. Zampelas, A.
12. Manios, Y.