Funding for this research was provided by:
Private Universität Witten/Herdecke gGmbH
Received: 5 May 2021
Accepted: 7 July 2021
First Online: 3 August 2021
: The study protocol was approved by the Institutional Review Board for Human Studies at the University of Witten/Herdecke. Written informed consent was obtained from all subjects or their legal guardian.
: Not applicable.
: The author group is funded by the Innovation Fund for Health Services Research (01VSF1905) of the German Federal Joint Committee. The Cologne study group (SBS, DSM, MWS, WW) received open research grants from Weinmann/Germany, Vivisol/Germany, Heinen und Löwenstein/Germany, VitalAire/Germany, and Phillips Respironics/USA. SBS received travel grants from companies dealing with mechanical ventilation products; DSM received open research grant from Philips Respironics/USA. TM, MWS and DK have nothing to declare; FSM received speaking fees from companies dealing with mechanical ventilation products. WW received speaking fees from companies dealing with mechanical ventilation products.