1. 1 Oral and Maxillofacial Radiology, Department of Growth and Development, University of Nebraska Medical Center (UNMC) College of Dentistry, Lincoln, Nebraska, USA
2. 2 Department of Growth and Development, UNMC College of Dentistry, Lincoln, Nebraska, USA
3. 3 Department of Prosthodontics, University of Connecticut (UConn) School of Dental Medicine, Farmington, Connecticut, USA
4. 4 UConn School of Dental Medicine, Farmington, Connecticut, USA