1. Division of Physical Therapy Education, Department of Health and Rehabilitation Sciences, College of Allied Health Professions, University of Nebraska Medical Center, Omaha, NE, United States
2. McGoogan Health Sciences Library, University of Nebraska Medical CenterLeon S. , Omaha, NE, United States
3. Department of Biostatistics, College of Public Health, University of Nebraska Medical Center, Omaha, NE, United States
4. Department of Neurorehabilitation, the First Rehabilitation Hospital of Shanghai, Shanghai, China