1. Department of Stomatology, Fifth Medical Center of Chinese PLA General Hospital, Beijing 100071, P.R. China
2. Department of Oncology Chemotherapy, Central South University Xiangya School of Medicine Affiliated Haikou People's Hospital, Haikou, Hainan 570208, P.R. China
3. Department of Outpatient Stomatology, Huzhou Traditional Chinese Medicine Hospital, Zhejiang Chinese Medicinal University, Huzhou, Wuxing, Zhejiang 313000, P.R. China
4. Deptartment of Oral and Maxillofacial Surgery, Regional Dental College, Guwahati, Assam 781021, India