Promoting Adolescent health through an intervention aimed at improving the quality of their participation in Physical Activity (PAPA): Background to the project and main trial protocol

1. Duda, J.L.
2. Quested, E.
3. Haug, E.
4. Samdal, O.
5. Wold, B.
6. Balaguer, I.
7. Castillo, I.
8. Sarrazin, P.
9. Papaioannou, A.
10. Ronglan, L.T.
11. Hall, H.
12. Cruz, J.