1Department of Advanced Oral Sciences and Therapeutics, University of Maryland School of Dentistry, Baltimore, MD, USA
2Central Texas Veterans Health Care System, Temple, TX USA
3Institute for Medical Biometry and Statistics, Faculty of Medicine and, Medical Center, University of Freiburg, Germany
4Department of Operative Dentistry, Periodontology, and Endodontology, University of Dental Medicine and Oral Health, Danube Private University, Krems, Austria
5Department of Prosthetic Dentistry, Center for Dental Medicine, Medical Center – University of Freiburg, Freiburg, Germany