[1] Univ Klinikum Hamburg Eppendorf, Zentrum Anasthesiol & Intens Med, Klin & Poliklin Anasthesiol, Martinistr 52, D-20246 Hamburg, Germany
[2] Klinikum Univ Witten Herdecke, Krankenhaus Koln Merheim, Klin Anasthesiol & operat Intens Med, Klin Anasthesiol & Operat Intens Med, Cologne, Germany
[3] Klin Anasthesie Intens Med Notfallmedizin & Schmer, Klin Anasthesie Intens Med Notfallmed & Schmerzthe, Hamburg, Germany
[4] Klin Anasthesie & Intens Med, Alexianer St Hedwig Kliniken Berlin GmbH, Berlin, Germany
[5] Evangel Amalie Sieveking Krankenhaus, Klin Anasthesiol & Intens Med, Hamburg, Germany
[6] Univ Klinikum Giessen, UKGM Justus Liebig Univ Giessen, Klin Anasthesiologie Operat Intens Med & Schmerzth, Giessen, Germany
[7] Univ Klinikum Ulm, Klin Anasthesiol & Intens Med, Ulm, Germany
[8] Philipps Univ Marburg, Klin Anasthesie & Intensivtherapie, Marburg, Germany
[9] Ludwig Maximilians Univ Munchen, Klin Anaesthesiol, Munich, Germany
[10] Univ Med Mainz, Klin Anasthesiol, Mainz, Germany
[11] Stadt Krankenhaus Kiel, Klin Anasthesie & Operat Intens Med, Kiel, Germany
[12] Univ Med Rostock, Klin & Poliklin Anasthesiol, Intens Med & Schmerztherapie, Rostock, Germany
[13] Johannes Gutenberg Univ Mainz, Gemeinschaftsklinikum Mittelrhein gGmbH, Kemperhof & Ev Stift St Martin, Akadem Lehrkrankenhaus,Klin Intens Med, Koblenz, Germany
[14] Charite Univ Med Berlin, Klin Anasthesiol Schwerpunkt Operat Intens Med, Berlin, Germany
[15] Free Univ Berlin, Berlin, Germany
[16] Humboldt Univ, Berlin, Germany
[17] Berlin Inst Hlth, Berlin, Germany