1. Department of Plastic and Reconstructive Surgery, Chang Gung Memorial Hospital, Chang Gung Medical College, Chang Gung University, Taoyuan City 333, Taiwan
2. Department of Orthopaedic Surgery, Chang Gung Memorial Hospital, Linkou Medical Center, Taoyuan City 333, Taiwan
3. Bone and Joint Research Center, Chang Gung Memorial Hospital, Linkou Medical Center, Taoyuan City 333, Taiwan