[1] Univ Hosp Psychiat Bern, Dept Psychiat Neurophysiol, CH-3000 Bern 60, Switzerland
[2] Univ Bern, Inselspital, Inst Diagnost & Intervent Neuroradiol, CH-3010 Bern, Switzerland
[3] Univ Bern, Inselspital, Dept Neurol, Div Neuropsychol Rehabil, CH-3010 Bern, Switzerland