1. Harvard School of Dental Medicine Boston Massachusetts USA
2. Department of Oral and Maxillofacial Surgery University of Pennsylvania, School of Dental Medicine Philadelphia Pennsylvania USA
3. Department of Oral and Maxillofacial Surgery Good Samaritan Medical Center Brockton Massachusetts USA
4. Department of Oral and Maxillofacial Surgery Kaohsiung Medical University, School of Dentistry Kaohsiung Taiwan
5. Department of Oral and Maxillofacial Surgery National University of Singapore, School of Dentistry Singapore Singapore