1. Department of Endodontics, Faculty of Dentistry, Hacettepe University, Ankara, Turkey.
2. Department of Periodontics and Endodontics, School of Dental Medicine, University at Buffalo, Buffalo, NY, USA.
3. Department of Prosthodontics, Faculty of Dentistry, Hacettepe University, Ankara, Turkey.
4. Division of Prosthodontics, Clinique Universitaire de Médecine Dentaire (CUMD), University of Geneva, Geneva, Switzerland.