Affiliation: | 1. Department of Oral Surgery and Stomatology, School of Dental Medicine, University of Bern, Bern, Switzerland;2. Department of Preventive, Pediatric and Restorative Dentistry, School of Dental Medicine, University of Bern and Private Practice limited to Endodontology, Bern, Switzerland;3. Department of Ambulatory Care and Community Medicine, University of Lausanne, Lausanne, Switzerland |