1. Department of Oral and Maxillofacial Surgery; Sun Yat-Sen Memorial Hospital of Sun Yat-Sen University; Guangzhou China
2. Department of Oral and Maxillofacial Surgery; Dental School of Araçatuba; Universidade Estadual Paulista (UNESP); Araçatuba São Paulo Brazil
3. Department of Prosthodontics; Sun Yat-Sen Memorial Hospital of Sun Yat-Sen University; Guangzhou China