Changes in Youth Baseball Pitching Biomechanics: A 7-Year Longitudinal Study. - Fleisig, Glenn S.; Diffendaffer, Alek Z.; Ivey, Brett; Aune, Kyle T.; Laughlin, Tony; Fortenbaugh, Dave; Bolt, Becky; Lucas, Wendy; Moore, Kevin D.; Dugas, Jeffrey R. (American Journal of Sports Medicine, 2018)