1. School of Materials Science & Engineering the Key Laboratory of Advanced Ceramics and Machining Technology by the Ministry of Education of China Tianjin University Yaguan Road 135# Tianjin 300072 P. R. China
2. School of Materials Science & Engineering Peking University Yiheyuan Road 5# Beijing 100871 P. R. China
3. School of Health Science & Biomedical Engineering Hebei University of Technology Xiping Avenue 5340# Tianjin 300401 P. R. China
4. Department of Orthopedics Guangdong Provincial People's Hospital Guangdong Academy of Medical Sciences Zhongshan 2nd Road 106# Guangzhou 510080 P. R. China