1. Department of Exercise Science, College of Health Sciences and Nursing, Belmont University, Nashville, Tennessee, USA.
2. Medical Specialists of Kentuckiana, Owensboro, Kentucky, USA.
3. Division of Physical Therapy, Medical School, University of Minnesota, Minneapolis, Minnesota, USA.
4. Division of Biostatistics, School of Public Health, University of Minnesota, Minneapolis, Minnesota, USA.
5. Adult and Gerontological Health Cooperative, School of Nursing, University of Minnesota, Minneapolis, Minnesota, USA.