[1] Univ Hosp Bern, Inselspital, Dept Neurol, CH-3010 Bern, Switzerland
[2] Univ Hosp Bern, Inselspital, Dept Neuropaediat, CH-3010 Bern, Switzerland
[3] Univ Hosp Bern, Inselspital, Dept Nucl Med, CH-3010 Bern, Switzerland
[4] Kantonsspital, Dept Neurol, St Gallen, Switzerland