1 Orthopedics Department, Hebei Yanda Hospital, Yanjiao Development Zone, 065201, Sanhe City, Langfang City, Hebei Province, People's Republic of China.
2 Orthopedics Department, Beijing Chao-Yang Hospital, Capital Medical University, No 8 Gongtinan Road, 100020, Beijing, People's Republic of China. QingheLiuChaoyang@163.com.