Periimplantitis

• Faculty of Dentistry at the University of OPorto — Porto, Porto District, Portugal

• Clinica Odontoiatrica, University of Foggia — Foggia, Italy
• University of Genoa — Genova, Italy
• University of Turin — Torino, Italy

• Department of Clinical Specialities. Faculty of Dentistry. Complutense University of Madrid. — Madrid, Spain

• Bluestone Center for Clinical Research. New York University College of Dentistry — New York, United States

• Mansoura university — Al Mansurah, Egypt

• Necmettin Erbakan University, dentistry Faculty — Konya, Turkey (Türkiye)

• Folktandvården Skanstull — Stockholm, Sweden
• Folktandvården Kaniken — Uppsala, Sweden

Not specified

• Gerhard Iglhaut — Memmingen, Germany

• Gaziosmanpasa University — Tokat Province, Turkey (Türkiye)