1. Division of Restorative and Prosthetic Dentistry, The Ohio State University College of Dentistry, 3005F Postle Hall, 305 W 12th Ave, Columbus, OH 43210, USA
2. Department of Oral Rehabilitation, Medical University of South Carolina College of Dental Medicine, BSB 335C, 175 Ashley Ave, Charleston, SC 29425, USA
3. Division of Biostatistics, The Ohio State University College of Public Health, 280A Cunz Hall, 1841 Neil Ave, Columbus, OH 43210, USA
4. Department of Biostatistics, The Ohio State University College of Arts and Sciences, 305E Cockins Hall, 1958 Neil Ave, Columbus, OH 43210, USA
5. Faculty of Dentistry, Fluminense Federal University, Niteroi 24020-140, RJ, Brazil
6. Missouri School of Dentistry & Oral Health, A. T. Still University, St. Louis, MO 63104, USA