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Dyfyniad Arddull ChicagoDeelen, Ineke, Dick Ettema, and Carlijn B. M. Kamphuis. "Time-use and Environmental Determinants of Dropout From Organized Youth Football and Tennis." BMC Public Health 2018.
Dyfyniad MLADeelen, Ineke, Dick Ettema, and Carlijn B. M. Kamphuis. "Time-use and Environmental Determinants of Dropout From Organized Youth Football and Tennis." BMC Public Health 2018.
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