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Determinants of Physical Activity and Screen Time Trajectories in 7th to 9th Grade Adolescents-A Longitudinal Study | 136 |
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Determinants of Physical Activity and Screen Time Trajectories in 7th to 9th Grade Adolescents-A Longitudinal Study | 0 | 0 | 1 | 10 | 9 | 2 | 1 |
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2020_Krist_etal.pdf | 114 |