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Article History

Received: 23 May 2018

Accepted: 14 August 2018

First Online: 31 August 2018

Ethics approval and consent to participate

: The local Ethical Committee of the Medical Association of the Rhineland Palatine state (Germany, Chairperson: Andrea Wagner, MD; 837.384.14 (9623)) approved this comparative, randomized clinical study. Each participant obtained detailed participation information and gave oral informed consent before being including in the study.

: Not applicable. This manuscript does not contain any data on individuals.

: Neither the Department of Anesthesiology of the University Medical Center of the Johannes Gutenberg University-Mainz, Germany nor any of its employees received any compensation for this work. No funding or competing interests are declared. None of the authors have financial interests, received honoraria or provided paid expert testimony. None of the authors have any personal relationships with people or organizations that could inappropriately influence this work. The authors alone are responsible for the content and writing of the paper.

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