1. Department of Mechanical Engineering, University of Hong Kong, Hong Kong, Hong Kong.
2. Department of Industrial and Manufacturing Systems Engineering, University of Hong Kong, Hong Kong, Hong Kong.
3. Department of Social Work and Social Administration; Sau Po Centre on Ageing, University of Hong Kong, Hong Kong, Hong Kong.
4. Department of Orthopaedics and Traumatology, University of Hong Kong, Hong Kong, Hong Kong.