Institution: | 1. Clinic of Conservative Dentistry and Periodontology, School of Dental Medicine, Christian‐Albrechts Universit?t at Kiel, Kiel, Germany;2. Department of Oral Medicine, The Second Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou, China;3. Oral Medicine and Periodontology Department, Faculty of Oral and Dental Medicine, Cairo University, Cairo, Egypt |