1. Department of Geriatric Medicine, Virginia Tech Carilion School of Medicine, Roanoke, VA, USA
2. Department of Psychiatry, Virginia Tech Carilion School of Medicine, Roanoke, VA, USA
3. Grado Department of Industrial and Systems Engineering, Virginia Polytechnic Institute and State University, Blacksburg, VA, USA
4. Charles L. Brown Department of Electrical and Computer Engineering, University of Virginia, Charlottesville, VA, USA
5. Wireless Health Interactive LLC, Vienna, VA, USA