Competing interests
EDWARDS
TWLS received research grants and honoraria from Edwards Lifesciences (Irvine, California, USA) and Masimo Inc. (Irvine, California, USA) for consulting and lecturing (all payments made to institution). TWLS is Editor-in-Chief of the Journal of Clinical Monitoring and Computing but had no role in the handling of this manuscript. TWLS is currently employed by Edwards Lifesciences. The other authors have no conflicting interests to declare.