[1] Heidelberg Univ, Univ Med Ctr Mannheim, Dept Radiat Oncol, Mannheim, Germany
[2] UKHD, Neuroradiol, Heidelberg, Germany
[3] Univ Manitoba, Dept Radiol, Winnipeg, MB, Canada
[4] Freiburg Univ, Med Ctr, Freiburg, Germany
[5] Univ Bonn, Univ Hosp Bonn, Dept Radiat Oncol, Bonn, Germany