1. Clinic for Oral and Cranio‐Maxillofacial Surgery Hightech Research Center University Hospital Basel University of Basel Basel Switzerland
2. Clinic for Oral and Cranio‐Maxillofacial Surgery Kantonsspital Aarau Aarau Switzerland
3. Unit for Oral & Maxillofacial Surgery Medical Healthcare Center Lörrach Lörrach Germany
4. Private Clinic for Oral and Maxillofacial Surgery Prof. Schlegel Munich Germany
5. Maxillofacial Surgery Department University Hospital Erlangen University of Erlangen Erlangen Germany
6. Department of Demography University of Bamberg Bamberg Germany
7. Dental Clinic for Oral Surgery and Implant Dentistry Prof. Gahlert Munich Germany
8. Department for Oral Surgery Faculty of Medicine Sigmund Freud University Vienna Vienna Austria