1 Department of orthopedics, Xuzhou Renci Hospital, Xuzhou, 221000, Jiangsu, China.
2 Department of Orthopedics, Northern Jiangsu People's Hospital Affiliated to Clinical Medical College, Yangzhou University, Yangzhou, 225001, Jiangsu, China.
3 Department of Orthopedics, Northern Jiangsu People's Hospital Affiliated to Clinical Medical College, Yangzhou University, Yangzhou, 225001, Jiangsu, China. Electronic address: doclhj@yeah.net.