1 School of Health and Rehabilitation Science, Department of Physical Therapy, University of Pittsburgh, USA; UPMC Health Plan - Department of Health Economics, USA. Electronic address: cbise@pitt.edu.
2 Physical Medicine & Rehabilitation Services, Butler VA Healthcare System, USA.
3 VA Pittsburgh Healthcare System, Pittsburgh, PA, USA.
4 Department of Medicine, Health Science Library System, University of Pittsburgh, USA.
5 School of Health and Rehabilitation Science, Department of Physical Therapy, University of Pittsburgh, USA.