[1] Landeskrankenhaus Feldkirch, Acad Teaching Hosp, Dept Pediat, A-6800 Feldkirch, Austria
[2] Med Univ Innsbruck, Dept Neurol, Innsbruck, Austria
[3] Landeskrankenhaus Bludenz, Dept Surg, Bludenz, Austria
[4] Landeskrankenhaus Bludenz, Dept Anesthesiol, Bludenz, Austria
[5] Austrian Red Cross, Vorarlberg Branch, Vienna, Austria
[6] Landeskrankenhaus Feldkirch, Acad Teaching Hosp, Dept Anesthesiol & Intens Care Med, Feldkirch, Austria