1. 1 Department of Dental Surgery, Faculty of Medical Sciences in Zabrze, Medical University of Silesia.
2. 2 Department for Oral, Cranio-Maxillofacial and Facial Plastic Surgery, FORM (Frankfurt Orofacial Regenerative Medicine) Lab, University Hospital Frankfurt, Goethe University.
3. 3 Department of Restorative Dentistry, School of Dental Medicine, State University of New York, Buffalo.
4. 4 Department of Periodontology, Tufts University School of Dental Medicine, Boston.