1. Department of Orthopaedics, The Second Xiangya Hospital of Central South University, Changsha, Hunan, China
2. Department of Thoracic Surgery, The Second Xiangya Hospital of Central South University, Changsha, Hunan, China
3. Department of Otolaryngology, Head and Neck Surgery, The Second Xiangya Hospital of Central South University, Changsha, Hunan, China
4. Clinical Medicine for Eight-Year-Program, Xiangya School of Medicine, Central South University, Changsha, Hunan, China