1. Program in Physical Therapy, Graduate School of Health Sciences, New York Medical College, Valhalla, New York, USA
2. Department of Biobehavioral Sciences, Teachers College, Columbia University, New York, New York, USA
3. Department of Rehabilitation Medicine, Sergievsky Center and the Taub Institute, College of Physicians and Surgeons, Columbia University, New York, New York, USA
4. Department of Neurology, Sergievsky Center and the Taub Institute, College of Physicians and Surgeons, Columbia University, New York, New York, USA