1. Department of Mechanical and Mechatronics Engineering, University of Waterloo, Waterloo, ON, Canada
2. Department of Mechanical Engineering, University of Michigan, Ann Arbor, MI, USA
3. Department of Internal Medicine, Division of Geriatric and Palliative Medicine, University of Michigan, Ann Arbor, MI, USA
4. Department of Computer and Information Sciences, Northumbria University, Newcastle upon Tyne, U.K.
5. Network Aging Research (NAR), Heidelberg University, Heidelberg, Germany