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W. Donker from the institutional research cooperation of the Cardiovascular and Respiratory physiology group of the University of Twente with Maquet Critical Care AB, Solna, Sweden and Sonion Nederland BV, Hoofddorp, The Netherlands (no personal honoraria received). C.L. Meuwese received research funding from \u201cStichting Gezondheidszorg Spaarneland (SGS)\u201d Fund and a Senior Dekker Clinical Scientist grant from the Dutch Heart Foundation \u201cHartstichting.\u201d Consultancy work for Getinge and reports having received speaker fees from AOP Medical, Abbot and J&J MedTech. CV reports research funding and speaking\/consulting fees from J&J MedTech. N. van Mieghem has received research grant support from Abbott Vascular, Boston scientific, Medtronic, Daiichi Sankyo, Teleflex, PulseCath BV and advisory fees from Anteris, JenaValve, Amgen, Abbott Vascular, Boston scientific, Medtronic, Daiichi Sankyo, Teleflex, PulseCath BV.","order":1,"name":"Ethics","label":"Competing interests","group":{"name":"EthicsHeading","label":"Declarations"}},{"value":"The institutional ethics committee approved an opt-out consent procedure (reference 21\u2013604\/C).","order":2,"name":"Ethics","label":"Ethical approval and consent to participate","group":{"name":"EthicsHeading","label":"Declarations"}},{"value":"All authors consent to publication of this manuscript.","order":3,"name":"Ethics","label":"Consent for publication","group":{"name":"EthicsHeading","label":"Declarations"}}],"article-number":"500"}}