[1] Univ Hosp Geneva, Dept Clin Neurosci, Div Neurol, CH-1211 Geneva 14, Switzerland
[2] Univ Hosp Geneva, Div Pulm Dis, CH-1211 Geneva 14, Switzerland
[3] Univ Hosp Geneva, Dept Anesthesiol Pharmacol & Intens Care, CH-1211 Geneva 14, Switzerland
[4] Univ Geneva, CH-1211 Geneva 4, Switzerland
[5] Univ Hosp Geneva, Dept Clin Neurosci, CH-1211 Geneva 14, Switzerland
[6] Univ Geneva, Inst Biomed Eth, CH-1211 Geneva 4, Switzerland