[1] Kantonsspital St Gallen, Neuromuscular Dis Unit, CH-9007 St Gallen, Switzerland
[2] CareFusion, Middleton, WI USA
[3] Uppsala Univ, Dept Neurosci, Uppsala, Sweden
[4] Milwaukee Vet Adm Med Ctr, Milwaukee, WI USA
[5] Med Coll Wisconsin, Milwaukee, WI 53226 USA
[6] Hosp Santa Maria, Neuromuscular Unit, Dept Neurosci, Inst Mol Med,Fac Med, Lisbon, Portugal
[7] Aarhus Univ Hosp, Dept Clin Neurophysiol, DK-8000 Aarhus, Denmark
[8] Radboud Univ Nijmegen, Med Ctr, Dept Neurol, Donders Inst Brain Cognit & Behav, NL-6525 ED Nijmegen, Netherlands
[9] Univ Basel Hosp, Dept Neurol, Basel, Switzerland