1. Department of Epidemiology, Gillings School of Global Public HealthUniversity of North Carolina at Chapel Hill Chapel Hill North Carolina
2. Thurston Arthritis Research CenterUniversity of North Carolina at Chapel Hill Chapel Hill North Carolina
3. Department of Epidemiology, College of Public HealthUniversity of Kentucky Lexington Kentucky
4. School of MedicineUniversity of North Carolina Chapel Hill North Carolina
5. Division of Physical TherapyUniversity of North Carolina at Chapel Hill Chapel Hill North Carolina
6. Injury Prevention Research CenterUniversity of North Carolina at Chapel Hill Chapel Hill North Carolina