1. ETEP (Etiology and Therapy of Periodontal Diseases) Research Group Department of Dental Clinical Specialties Faculty of Dentistry University Complutense of Madrid (UCM) Madrid Spain
2. Departments of Microbiology & Immunology, OB&GYN, Medical Sciences (Oncology), College of Dental Medicine, Vagelos College of Physicians & Surgeons Columbia University Irving Medical Center, Herbert Irving Comprehensive Cancer Center New York NY USA
3. Division of Periodontology & Endodontology Department of Oral Rehabilitation, Health Sciences University of Hokkaido Hokkaido Japan