1. From the Department of Rehabilitation Sciences, The Hong Kong Polytechnic University, Hung Hom, Hong Kong (Special Administrative Region) (T.-W.L., G.Y.F.N., R.C.K.C., S.S.M.N.)
2. School of Nursing and Health Studies, The Open University of Hong Kong, Ho Man Tin, Hong Kong (Special Administrative Region) (T.-W.L.).