1. JS Brach, PT, PhD, GCS, is Assistant Professor, Department of Physical Therapy, School of Health and Rehabilitation Sciences, University of Pittsburgh, 6035 Forbes Tower, Pittsburgh, PA 15260 (USA).
2. JB Talkowski, PT, MPT, is Instructor, Department of Physical Therapy, School of Health and Rehabilitation Sciences, University of Pittsburgh.
3. ES Strotmeyer, PhD, MPH, is Assistant Professor, Department of Epidemiology, Graduate School of Public Health, University of Pittsburgh.
4. AB Newman, MD, MPH, is Professor, Department of Epidemiology, Graduate School of Public Health, and Division of Geriatric Medicine, Department of Medicine, University of Pittsburgh.