Acknowledgement
Dr. Yiu-Chung Wong, former Director of the Total Joint Replacement Centre, Yan Chai Hospital, Hong Kong, for foundation of our center and being the chief surgeon of many of the cases included in the current study. Ms. Esther Wai-Yee Chang, Nursing Consultant, Kowloon West Cluster, Hospital Authority, Hong Kong, for establishing and operating the data base of the patients in our center.
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