[1] Eberhard Karls Univ Tubingen, Dept Diagnost & Intervent Radiol, Tubingen, Germany
[2] Eberhard Karls Univ Tubingen, Rheumatol, Tubingen, Germany
[3] Eberhard Karls Univ Tubingen, Dept Neurol, Tubingen, Germany
[4] Eberhard Karls Univ Tubingen, Dept Diagnost & Intervent Neuroadiol, Tubingen, Germany
[5] Hirslanden Hosp Hirslanden, Neuroradiol, Zurich, Switzerland
[6] Eberhard Karls Univ Tubingen, Dept Diagnost & Intervent Neuroadiol, Hoppe Seyler Str, D-372076 Tubingen, Germany