1. Key Laboratory of Shaanxi Province for Craniofacial Precision Medicine ResearchCollege of Stomatology, Xi'an Jiaotong University Xi'an P. R. China
2. Clinical Research Center of Shaanxi Province for Dental and Maxillofacial DiseasesCollege of Stomatology, Xi'an Jiaotong University Xi'an P. R. China
3. College of Medicine & Forensics, Xi'an Jiaotong University Health Science Center Xi'an P. R. China
4. Department of EpidemiologyUniversity of Washington Seattle WA USA
5. Department of Forensic GeneticsSchool of Forensic Medicine, Southern Medical University Guangzhou P. R. China