1 The School of Nursing, Sun Yat-Sen University, Guangzhou, China.
2 The Nethersole School of Nursing, Faculty of Medicine, The Chinese University of Hong Kong, Shatin, N.T., Hong Kong, Special Administrative Region, China.
3 The Neighbourhood Advice-Action Council, North Point, Hong Kong, Special Administrative Region, China.
4 The Nethersole School of Nursing, Faculty of Medicine, The Chinese University of Hong Kong, Shatin, N.T., Hong Kong, Special Administrative Region, China. [email protected].