1. INAIL, Via Rabuina 14, Vigorso di Budrio, 40054 Bologna, Italy
2. Department of Industrial Engineering, University of Padova, 35131 Padova, Italy
3. Minneapolis VA Health Care System, One Veterans Drive, Minneapolis, MN 55417, USA
4. Department of Family Medicine and Community Health, Department of Biomedical Engineering, University of Minnesota, Minneapolis, MN 55455, USA
5. NUOPC, Department of Physical Medicine and Rehabilitation, Northwestern University, 680 N Lake Shore Dr, Suite 1100, Chicago, IL 60611, USA
6. Department of Rehabilitation Medicine, University of Washington, 1959 NE Pacific St., P.O. Box 356490, Seattle, WA 98195, USA