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Annemarie M.H. de Witte, Monique A.M. Berger, Marco J.M. Hoozemans, Dirkjan H.E.J. Veeger and Lucas H.V. van der Woude

differences between game situation and ball possession for the main activities. Figure 2 —Differences in mean relative duration (%) of wheelchair–athlete activities between offense and defense situation. Deviation from the axis means that the activity is performed longer during offense/defense than the other

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Srinidhi Bellamkonda, Samantha J. Woodward, Eamon Campolettano, Ryan Gellner, Mireille E. Kelley, Derek A. Jones, Amaris Genemaras, Jonathan G. Beckwith, Richard M. Greenwald, Arthur C. Maerlender, Steven Rowson, Stefan M. Duma, Jillian E. Urban, Joel D. Stitzel and Joseph J. Crisco

specific position to each youth player was challenging; majority of youth players in these programs participated in offense, defense, and special teams, including various positions within each unit. Previous studies have attributed differences in head impact exposure among teams and programs to variations

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Dustin A. Hahn, Matthew S. VanDyke and R. Glenn Cummins

entire team or a particular unit within the team (e.g., offense, defense, etc.). “Other” references were presentations of quantitative metrics that might relate to more global entities such as conferences, multiple games, or groups of players not on a single team. Presentation form was also a nominal

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Weidong Li, Xiuye Xie and Huanyu Li

situated set play in their assigned groups. The guiding questions can include but are not limited to: (a) Where was the goal? (b) Who had the ball? (c) Where were the offense/defense players? (d) What was your role in this situation? (e) What techniques could my teammate/I use? (f) What tactics (tricks

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Sarah A. McGraw, Christopher R. Deubert, Holly Fernandez Lynch, Alixandra Nozzolillo, Lauren Taylor and I. Glenn Cohen

(minimum of 16 games). 3 We also sought to include interviewees from a range of position groups (offense, defense and special teams), position types, race, and years removed from playing for former players. Data Analysis To identify and describe themes relevant to NFL player health, we employed content