1. Faculty of Dentistry, Beirut Arab University, Beirut 11072809, Lebanon
2. Division of Restorative and Prosthetic Dentisry, College of Dentistry, The Ohio State University, Columbus, OH 43210, USA
3. Independent Researcher, Beirut, Lebanon
4. Division of Dental Biomaterials, Clinic for Reconstructive Dentistry, Center for Dental Medicine, University of Zurich, 8032 Zurich, Switzerland
5. Department of Reconstructive Dentistry and Gerodontology, School of Dental Medicine, University of Bern, 3010 Bern, Switzerland