1. Department of Oro-maxillofacial Head and Neck Oncology, Shanghai Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai Key Laboratory of Stomatology, Shanghai
2. Department of General Surgery, The Forth Hospital of Jinan City, Jinan
3. Department of Medical Records Statistics, Qianfoshan Hospital Affiliated to Shandong University, Jinan, China