Author: Nollet. F., Beelen, A., Sargeant. A.J., de Visser, M,. Lankhorst. G.J., de Jong, B.A
Journal/Publisher: Archives of Physical Medicine and Rehabilitation
Issue: 2001: 82(12): 1678-85
http://www.archives-pmr.org/article/S0003-9993(01)24451-7/fulltext