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Raghuveer, Geetha, Hartz, Jacob, Lubans, David R., Takken, Timothy, Wiltz, Jennifer L., Mietus-Snyder, Michele, Perak, Amanda M., Baker-Smith, Carissa, Pietris, Nicholas, Edwards, Nicholas M.. Lippincott Williams & Wilkins; 2020. Cardiorespiratory fitness in youth: an important marker of health: a scientific statement from the American Heart Association.