1. University of Kansas School of Medicine, Kansas City, Kansas, USA.
2. University of Kansas School of Medicine-Salina, Population Health and Surgery, Salina, Kansas, USA.
3. Department of Population Health, University of Kansas School of Medicine, Kansas City, Kansas, USA.
4. Department of Sociology, University of Kansas-Lawrence, Lawrence, Kansas, USA.
5. Department of Orthopaedic Surgery, University of Kansas Medical Center, Kansas City, Kansas, USA.