[1] Univ Hosp Geneva, Diagnost Neuroradiol Unit, Dept Radiol, CH-1211 Geneva 14, Switzerland
[2] Ist Sci San Raffaele, Dept Neuroradiol, I-20132 Milan, Italy
[3] Ist Sci San Raffaele, Neuroimaging Res Unit, Dept Neurol, I-20132 Milan, Italy
[4] Univ Erlangen Nurnberg, Dept Neuroradiol, Erlangen, Germany
[5] German Canc Res Ctr, Dept Radiol, D-6900 Heidelberg, Germany
[6] Duke Univ, Med Ctr, Dept Med, Durham, NC 27710 USA
[7] Univ Basel Hosp, Dept Neurol, CH-4031 Basel, Switzerland
[8] Yonsei Univ, Coll Med, Dept Radiol, Seoul, South Korea