1. International Spine and Pain Institute, Story City, IA, USA
2. Phileo Health, Eau Claire, WI, USA
3. School of Health Sciences; Department of Physical Therapy, University of South Dakota, Vermillion, SD, USA
4. Physical Therapy Rehabilitation, Kaiser Foundation Rehabilitation Center, Vallejo, CA, USA
5. School of Allied Health Sciences, Department of Physical Therapy, University of Nevada Las Vegas, Las Vegas, NV, USA