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Zhang, Xu-Hao, Li, Shu-Chuen, Xie, Feng, Lo, Ngai-Nung, Yang, Kwang-Ying, Yeo, Seng-Jin, Fong, Kok-Yong, Thumboo, Julian. Elsevier; 2012. An exploratory study of response shift in health-related quality of life and utility assessment among patients with osteoarthritis undergoing total knee replacement surgery in a tertiary hospital in Singapore.