1. Division of Regenerative and Implant Sciences, Department of Restorative Dentistry and Biomaterials Sciences; Harvard School of Dental Medicine; Boston Massachusetts
2. Department of Prosthodontics and Biomaterial Sciences; King Saud University; Riyadh Saudi Arabia
3. Department of Oral, Maxillofacial and Plastic Surgery; University Medical Centre Rostock; Germany
4. Department of Dentistry; State University of Maringá; Paraná Brazil