1. Department of Kinesiology and Applied Physiology, University of Delaware, Newark, Delaware, USA.
2. Biomechanics and Movement Science Interdisciplinary Program, University of Delaware, Newark, Delaware, USA.
3. Interfaculty Initiative in Health Policy, Harvard University, Cambridge, Massachusetts, USA.
4. Micheli Center for Sport Injury Prevention, Division of Sports Medicine, Boston Children's Hospital, Waltham, Massachusetts, USA.