Associations between changes in physical fitness and psychological difficulties status among Norwegian adolescents
| Autor: | Åvitsland, Andreas, Leibinger, Eva, Kolle, Elin, Haugen, Tommy, Dyrstad, Sindre M. |
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| Zdroj: | In Mental Health and Physical Activity October 2021 21 |
| Databáze: | ScienceDirect |
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