Guo Feng, male, doctor of medicine, associate professor and deputy chief physician. He is currently an associate professor of oral and maxillofacial surgery at the School of Stomatology, Central South University, and the deputy chief physician of oral and maxillofacial surgery at Xiangya Hospital, Central South University. Director of Hunan Stomatological Association, member of Chinese Stomatological Association, and member of Geriatrics Committee of Chinese Stomatological Association.