Funding text :
Conflicts of Interest: V. L. Bonhomme has had or continues to have financial relationships with Orion Pharma, Edwards Medical, Medtronic, Gr\u00FCnenthal, and Elsevier. He is Deputy Editor-in-Chief of the Acta Anaesthesiologica Belgica. Funding: This work was supported by the Department of Anesthesia and Intensive Care Medicine, Liege University Hospital, Liege, Belgium. This manuscript was handled by: Jiro Kurata, MD, PhD.
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