1. Department of Electrical and Computer Engineering, Swanson School of Engineering, University of Pittsburgh, USA
2. Department of Physical Therapy, School of Health and Rehabilitation Sciences, University of Pittsburgh, USA
3. Division of Geriatric Medicine, Department of Medicine, School of Medicine, University of Pittsburgh, USA
4. Department of Mental Health, Johns Hopkins Bloomberg School of Public Health, Johns Hopkins University, USA
5. Department of Bioengineering, Swanson School of Engineering, University of Pittsburgh, USA
6. Department of Epidemiology, School of Public Health, University of Pittsburgh, Pittsburgh, PA, USA