1Department of Orthopaedic Surgery, Uijongbu St. Mary Hospital, The Catholic University of Korea, #65-1 Keumohdong, Uijongbusi, Gyunggido, Korea, , KR
2Orthopaedic Oncology, Orthopaedic Hospital, Los Angeles, California, USA, , US
3Department of Pathology, Kaiser Permanente, Woodland Hills, California, USA, , US