1. Institute of Medical Engineering Department of Biophysics School of Basic Medical Sciences Health Science Center Xi'an Jiaotong University Xi'an 710061 P. R. China
2. Department of Orthopedic Surgery The First Affiliated Hospital of Dalian Medical University Dalian Liaoning 116011 P. R. China
3. Department of Rehabilitation Medicine The First Medical Center Chinese PLA General Hospital Beijing 100853 P. R. China
4. POLYMAT Applied Chemistry Department Faculty of Chemistry University of the Basque Country UPV/EHU Paseo Manuel de Lardizabal 3 Donostia‐San Sebastián 20018 Spain