1. Department of Operative and Preventive Dentistry, Bonn University, Welschnonnenstrasse 17, D-53111 Bonn, Germany
2. Oral Technology, Bonn University, Wilhelmsplatz 5, 53111 Bonn, Germany
3. Center of Dento-Maxillo-Facial Medicine, Bonn University, Welschnonnenstrasse 17, D-53111 Bonn, Germany
4. Center of Applied Medical Laser Research and Biomedical Optics (AMLaReBO), Bonn University, Welschnonnenstrasse 17, D-53111 Bonn, Germany
5. Laser Application in Medical Sciences Research Center, Shahid Beheshti University of Medical Sciences, Tehran, Iran