[1] Univ Hosp Schleswig Holstein, Dept Oral & Maxillofacial Surg, D-72076 Kiel, Germany
[2] Univ Tubingen Hosp, Dept Diagnost & Intervent Neuroradiol, D-72076 Tubingen, Germany
[3] Univ Tubingen Hosp, Dept Oral & Maxillofacial Surg, D-72076 Tubingen, Germany
[4] Univ Heidelberg Hosp, Dept Oral & Maxillofacial Surg, D-69120 Heidelberg, Germany