1. Division of Restorative and Prosthetic Dentistry, The Ohio State University College of Dentistry, Columbus, OH 43210, USA
2. Faculty of Science and Technology, Virtual University of Pakistan, Lahore 54000, Pakistan
3. Division of Oral and Maxillofacial Radiology, The Ohio State University College of Dentistry, Columbus, OH 43210, USA
4. Missouri School of Dentistry & Oral Health, A. T. Still University, St. Louis, MO 63104, USA