1. Department of Radiology, School of Medicine University of Michigan Ann Arbor MI USA
2. Department of Oral and Maxillofacial Surgery Chi Mei Medical Center Tainan Taiwan
3. Department of Periodontics and Oral Medicine, School of Dentistry University of Michigan Ann Arbor MI USA
4. Department of Periodontics, College of Dentistry and Dental Clinics University of Iowa Iowa City IA USA
5. Department of Dentistry College of Medicine and Graduate School of Medicine, Jeju National University Jeju Republic of Korea