1. State Key Laboratory of Military Stomatology; National Clinical Research Center for Oral Diseases; Shaanxi Clinical Research Center for Oral Diseases; Department of Oral and Maxillofacial Surgery; School of Stomatology; Fourth Military Medical University; Xi'an China
2. Department of Stomatology; Fengtai Hospital; Peking University First Hospital; Beijing China
3. Department of Otolaryngology Head Neck Surgery; Navy General Hospital; Beijing China