1 Rehabilitation Institute of Chicago, Chicago, IL, USA
2 Korea University College of Medicine, Seoul, Korea
3 Northwestern University, Chicago, Chicago, IL, USA
4 Northwestern University, Evanston, Evanston, IL, USA
Corresponding Author:
Li-Qun Zhang, PhD, 345 East Superior Street, Suite 1406, Chicago, IL 60611, USA Email: l-zhang@northwestern.edu