1. B. Black, PT, DSc, Rocky Mountain University of Health Professions, Provo, Utah, and Physical Therapy Program, School of Health Sciences, Oakland University, 2200 N Squirrel Rd, Rochester, MI 48309-4401 (USA).
2. B.C. Marcoux, PT, DPT, PhD, Physical Therapy Program, College of Human Science and Services, University of Rhode Island, Kingston, Rhode Island.
3. C. Stiller, PT, PhD, Physical Therapy Program, School of Health Sciences, Oakland University.
4. X. Qu, PhD, Department of Mathematics and Statistics, Oakland University.
5. R. Gellish, MS, School of Health Sciences, Oakland University.