University of Göttingen - Department of Nephrology and Rheumatology, University of Goettingen (Gottingen) - Clinic of Anaesthesiology, RWTH Aachen University - Division of Nephrology and Clinical Immunology, University of Göttingen - Department of Nephrology and Rheumatology, University of Hamburg - Department of Medicine, University of Witten/Herdecke Medical Center - Department of Medicine I, University of Witten/Herdecke Medical Center - Department of Medicine I, University of Witten/Herdecke Medical Center - Department of Medicine I, University of Witten/Herdecke Medical Center - Department of Pneumology and Critical Care Medicine, University of Hamburg - Department of Intensive Care, RWTH Aachen University - Division of Nephrology and Clinical Immunology, University of Hamburg - University Medical Center Hamburg-Eppendorf, University of Hamburg - Department of Medicine, University of Hamburg - Department of Medicine, University of Hamburg - Department of Medicine, University Medical Center Hamburg-Eppendorf - First Department of Medicine, University of Goettingen (Gottingen) - Institute of Infection Control and Infectious Diseases, University of Goettingen (Gottingen) - Department of Medical Statistics, RWTH Aachen University - Division of Nephrology and Clinical Immunology, University of Hamburg - Department of Medicine and University of Goettingen (Gottingen) - Emergency Department