Program in Physical Therapy (NEF), Wayne State University, Detroit MI; Physical Therapy Division (DK, AK), School of Health and Rehabilitation Sciences, The Ohio State University, Columbus; Program in Physical Therapy (AKR), Department of Rehabilitative and Regenerative Medicine, G.H. Sergievsky Center, Columbia University, New York; Department of Biobehavioral Sciences (LQ), Teachers College, Columbia University, New York; and Hennepin County Medical Center (MAN), Minneapolis.