[1] Goethe Univ, Univ Hosp Frankfurt, Dept Anaesthesiol Intens Care Med & Pain Therapy, Frankfurt, Germany
[2] Univ Hosp Wurzburg, Dept Anaesthesiol Intens Care Emergency & Pain Me, Wurzburg, Germany
[3] Goethe Univ, Inst Biostat & Math Modelling, Dept Med, Frankfurt, Germany
[4] German Red Cross Blood Transfus Serv Baden Wuertt, Inst Transfus Med & Immunohaematol, Kassel, Germany
[5] German Red Cross Blood Transfus Serv Baden Wuertt, Inst Transfus Med & Immunohaematol, Frankfurt, Germany
[6] Klinikum Westmuensterland, Dept Anaesthesiol Intens Care Med & Pain Therapy, Bocholt, Germany
[7] Agatharied Hosp, Dept Anaesthesiol & Intens Care Med, Hausham, Germany
[8] Muenchen Klin, Dept Anaesthesiol Operat Intens Care Med & Pain T, Munich, Germany
[9] Muenchen Klin, Dept Finance, Cent Controlling, Munich, Germany
[10] Klinikum Leverkusen, Dept Anaesthesiol & Intens Care Med, Leverkusen, Germany
[11] Univ Med Ctr Schleswig Holstein, Dept Anaesthesiol & Operat Intens Care Med, Kiel, Germany
[12] Donauisar Klinikum, Inst Lab Diagnost & Transfus Med, Deggendorf, Germany
[13] Univ Hosp Jena, Dept Anaesthesiol & Intens Care Med, Jena, Germany
[14] Univ Hosp Jena, Execut Dept Struct Proc & Qual Management, Jena, Germany
[15] Diakonie Hosp Martha Maria, Dept Anaesthesiol & Operat Intens Care Med, Nurnberg, Germany
[16] Univ Hosp Muenster, Dept Anaesthesiol Intens Care & Pain Med, Munster, Germany
[17] Ortenau Klinikum, Dept Anaesthesiol & Operat Intens Care Med, Kehl, Germany
[18] Univ Hosp Bonn, Dept Anaesthesiol & Operat Intens Care Med, Bonn, Germany
[19] SLK Kliniken, Dept Anaesthesiol, Heilbronn, Germany