1. Institute of Gerontology College of Medicine National Cheng Kung University Tainan Taiwan
2. Department of Statistics College of Management National Cheng Kung University Tainan Taiwan
3. School of Nursing LKS Faculty of Medicine The University of Hong Kong Pokfulam Hong Kong SAR
4. School of Nursing and Midwifery Western Sydney University Sydney New South Wales Australia
5. WHO Collaborating Centre for Community Health Services School of Nursing The Hong Kong Polytechnic University Hung Hom Hong Kong SAR