Periodontal Diseases

• Unit of Dental Hygiene - Section of Dentistry - Department of Clinical, Surgical, Diagnostic and Paediatrics - University of Pavia — Pavia, Lombardy, Italy

• Veterans Affairs Medical Center, Omaha — Omaha, Nebraska, United States

Not specified

• University of Medicine and Pharmacy at Ho Chi Minh city — Ho Chi Minh City, Vietnam

• University of Nebraska, College of Dentistry — Lincoln, Nebraska, United States

• University of Baghdad\ College of Dentistry — Baghdad, Bab Al-Moadham, Iraq

• Rania Hassan Shalby — Giza, Egypt

• University of Nebraska Medical Center, College of Dentistry — Lincoln, Nebraska, United States

• Blekinge Institute of Technology — Karlskrona, Sweden

Not specified