Affiliation: | (1) Rijksuniversiteit Utrecht, Fysisch Laboratorium, Department of Medical and Physiological Physics, Princetonplein 5, NL-3584 CC Utrecht, The Netherlands;(2) Department of Physiology, Northwestern University, Medical School, 303 East Chicago Avenue, 60611 Chicago, IL, USA;(3) Rehabilitation Institute of Chicago, 345 East Superior Street, 60611 Chicago, IL, USA |