1. Department of Orthopaedic Surgery, Korea University Ansan Hospital, Ansan Si, Gyeonggi Do, Korea.
2. Department of Orthopaedic Surgery, Korea University College of Medicine, Guro Hospital, Guro Gu, Seoul, Republic of Korea.
3. National University of Singapore Tissue Engineering Program (NUSTEP), Centre for Biomedical Materials Applications and Technology (BIOMAT), Department of Mechanical Engineering, National University of Singapore, Singapore, Singapore.