1. University of Maryland, School of Medicine, Department of Physical Therapy, 100 Penn Street, Baltimore, MD 21201, USA. Tel.: ; E-mail: galon@som.umaryland.edu
2. Gotenborg University, Department of Rehabilitation Medicine, Sahlgrenska University Hospital, S-413 45 Göteborg, Sweden
3. Department of Rehabilitation Medicine, St. Maartenskliniek, PO Box 9011, 6500 GM Nijmegen, The Netherlands
4. Sackler Faculty of Medicine, Department of Rehabilitation Medicine, Reuth Medical Center, Shderoth Hachail 2 Yad Eliyhau, Tel Aviv 61092, Israel