[1] Saarland University,Clinic of Operative Dentistry, Periodontology and Preventive Dentistry, Saarland University Hospital
[2] University of Freiburg,Department of Operative Dentistry and Periodontology, Centre for Dental Medicine, Oral and Maxillofacial Surgery, Medical Centre
[3] Danube Private University,Division of Endodontics, Department of Dentistry, Faculty of Medicine and Dentistry
[4] Saarland University,Chair of Synoptic Dentistry