[1] Univ Hosp Hamburg Eppendorf, Dept Intens Care Med, Ctr Anesthesiol & Intens Care Med, Martinistr 52, D-20246 Hamburg, Germany
[2] Kassel Hosp, Dept Gastroenterol Endocrinol Diabetol & Gen Med, Kassel, Germany
[3] Kassel Hosp, Dept Cardiol & Intens Care Med, Kassel, Germany