Affiliations: Physical Medicine and Rehabilitation, Rehabilitation
Institute of Chicago, Chicago, IL, USA | Northwestern Feinberg School of Medicine, Chicago, IL,
USA
Note: [] Corresponding author: Deborah Gaebler-Spira, 345 East Superior
Street, Chicago, IL 60611, USA. Tel.: +1 312 238 1154; Fax: +1 312 238 1208;
E-mail: DGaebler@ric.org