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Written informed consent was obtained from all patients.","order":1,"name":"Ethics","group":{"name":"EthicsHeading","label":"Ethics approval and consent to participate"}},{"value":"Not applicable.","order":2,"name":"Ethics","group":{"name":"EthicsHeading","label":"Consent for publication"}},{"value":"Anselm Br\u00e4uer is a member of the advisory board of 3\u2009M Europe and has received payments from 3\u2009M Germany, 3\u2009M Europe, 3\u2009M Asia Pacific Pte Ltd. for consultancy work. All other authors have no interests to declare.This work was presented in part at the German Anaesthesia Congress in Nuernberg, Germany on 4th of May 2017.","order":3,"name":"Ethics","group":{"name":"EthicsHeading","label":"Competing interests"}},{"value":"Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.","order":4,"name":"Ethics","group":{"name":"EthicsHeading","label":"Publisher\u2019s Note"}}],"article-number":"55"}}