1. Department of Periodontology, Division of Dental Research Administration, Tufts University School of Dental Medicine, Boston, MA 02111, USA
2. Department of Implant Dentistry, Universidade Iguaçu, Nova Iguaçu 26260-045, Brazil
3. Frankfurt Oral Regenerative Medicine, Clinic for Maxillofacial and Plastic Surgery, Johann Wolfgang Goethe University, 60596 Frankfurt Am Main, Germany
4. Department of Periodontics and Implant Dentistry, University of the Andes, Santiago 12455, Chile
5. Division of Oral Bioengineering, Niigata University Graduate School of Medical and Dental Sciences, Niigata 951-8514, Japan
6. Clinical Research Unit, Antonio Pedro Hospital, Fluminense Federal University, Niterói 24033-900, Brazil
7. Department of Oral and Maxillofacial Surgery and Periodontology, School of Dentistry of Ribeirao Preto, University of Sao Paulo, Ribeirao Preto 14040-904, Brazil