[1] Univ Bern, Bern Univ Hosp, Dept Cardiol, Inselspital, CH-3010 Bern, Switzerland
[2] Univ Bern, Bern Univ Hosp, Dept Anaesthesiol & Pain Med, Inselspital, Bern, Switzerland
[3] Univ Bern, Bern Univ Hosp, Inst Diagnost & Intervent Neuroradiol, Inselspital, Bern, Switzerland
[4] Univ Hosp, Dept Neurol, Inselspital, Bern, Switzerland
[5] Univ Bern, Bern, Switzerland