1. S Blanton, PT, is Staff Physical Therapist, Physical Therapy Department, Emory Center for Rehabilitation Medicine, 1441 Clifton Rd, Atlanta, GA 30322 (USA).
2. SL Wolf, PhD, PT, FAPTA, is Professor and Director of Research, Department of Rehabilitation Medicine, and Associate Professor, Department of Cell Biology, Emory University School of Medicine, Atlanta, Ga.