1. Department of Orthopedics, Yantaishan Hospital, Yantai, China
2. Department of Orthopedics and Traumatology, Dezhou Hospital of Traditional Chinese Medicine, Dezhou, China
3. Clinical Teaching and Research Section, Yantai Nursing School, Yantai, China
4. Department of Joint Surgery, the Second Hospital of Shandong University, Jinan, China