Gingivitis

• Nihon University Hospital, School of Dentistry at Matsudo — Matsudo, Chiba, Japan
• Tohoku University Dental Hospital — Sendai, Miyagi, Japan
• Osaka University Dental Hospital — Suita, Osaka, Japan
• Nihon University Dental Hospital — Chiyoda-ku, Tokyo, Japan

• Firsthand Technology Inc. — Seattle, Washington, United States

• Dr. Fernando Autran — Barcelona, Spain

Not specified

Not specified

Not specified

• Universidad de Antioquia, School of dentistry — Medellín, Antioquia, Colombia

• The Center for Women's Reproductive Health at UAB — Birmingham, Alabama, United States

• Dr. Geza Terézhalmy, DDS , MA — San Antonio, Texas, United States
• Luis R. Archila, DDS — Guatemala City, Guatemala

• University of Texas Health Science Center at San Antonio — San Antonio, Texas, United States