Sex Differences in Competition Volume, Club Sport Participation, Specialization, and Injury Among High School Athletes: 2510 Board #30 June 2 11. (May 2017) - Post, Eric G.; Bell, David R.; Trigsted, Stephanie M.; Schaefer, Dan A.; Miller, Madeline M.; Pfaller, Adam Y.; Hetzel, Scott B.; Brooks, M. Alison; McGuine, Timothy A.