1. Research Service Line, Department of Communication Sciences and Disorders, Michael E. DeBakey VA Medical Center and University of Houston, 2002 Holcombe Boulevard, Houston, TX 77030, USA
2. Health Services Research and Development Center of Excellence, Department of Neurology, Michael E. DeBakey VA Medical Center and Baylor College of Medicine, 2002 Holcombe Boulevard, Houston, TX 77030, USA
3. Health Services Research and Development Center of Excellence, Department of Medicine, Michael E. DeBakey VA Medical Center and Baylor College of Medicine, 2002 Holcombe Boulevard, Houston, TX 77030, USA