1. Private practice Torino Italy
2. Department of Maxillo‐facial Surgery University of Torino Torino Italy
3. Department of Periodontics and Oral Medicine University of Michigan Ann Arbor Michigan USA
4. Department of Periodontology, School of Dental Medicine University of Bern Bern Switzerland
5. Department of Oral and Maxillo‐facial Surgery Copenhagen University Hospital (Rigshospitalet) Copenhagen Denmark