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Funding This study is supported by a Chinese University research grant, a Hong Kong Arthritis and Rheumatism Foundation research grant, and an educational grant from Janssen Pharmaceutical (Hong Kong). The study drugs were provided by Janssen Pharmaceutical (Hong Kong) and Wyeth (Hong Kong), who had no role in the study design, data collection, data analysis or writing of the manuscript.
Competing interests None.
Ethics approval This study was conducted with the approval of The Chinese University of Hong Kong.
Provenance and peer review Not commissioned; externally peer reviewed.