[1] Univ Med Ctr Hamburg Eppendorf, Dept Oral & Maxillofacial Surg, Hamburg, Germany
[2] Med Univ Vienna, Dept Oral & Maxillofacial Surg, Waehringer Guertel 18-20, A-1090 Vienna, Austria
[3] Tech Univ Munich, TUM Sch Management Res & Sci Management, Munich, Germany
[4] Univ Alcala Henares, Dept Oral & Maxillofacial Surg, Hosp Univ Ramon y Cajal, Madrid, Spain
[5] Hosp Gen & Univ Vall dHebron, Serv Cirugia Maxilofacial, Barcelona, Spain