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