1. Bioengineering Laboratory, Department of Orthopaedic Surgery, Massachusetts General Hospital/Harvard Medical School, Boston, MA, USA
2. Department of Orthopaedic Surgery, Korea University Guro Hospital, Seoul, Korea
3. Department of Orthopaedic Surgery, Inje University Ilsan Paik Hospital, Goyang, Korea
4. Department of Orthopaedic Surgery, Dongguk University Ilsan Hospital, Goyang, Korea