1. Department of Restorative Dentistry and Biomaterials Science, Harvard School of Dental Medicine Harvard University Boston Massachusetts USA
2. Section of Graduate Periodontology, School of Dentistry University Complutense Madrid Spain
3. Department of Periodontology, School of Dentistry National Defense Medical Center and Tri‐Service General Hospital Taipei Taiwan
4. Department of Periodontology Mackay Memorial Hospital Taipei Taiwan
5. ETEP (Etiology and Therapy of Periodontal and Peri‐implant Diseases) Research Group University Complutense Madrid Spain
6. Division of Oral Restorative and Rehabilitative Sciences University of Western Australia Perth Australia