1. Department of Oral and Maxillofacial Surgery University of Groningen, University Medical Center Groningen Groningen the Netherlands
2. Department of Oral Medicine & Pathology and Hospital Dentistry, School of Dentistry National and Kapodistrian University of Athens Athens Greece
3. Faculty of Dentistry CES University Medellin Colombia
4. Center of Dental Medicine, Department of Medicine and Surgery University of Parma Parma Italy