Document is current

Article History

Received: 4 October 2018

Accepted: 12 June 2019

First Online: 2 July 2019

Compliance with ethical guidelines

:

: A. Polzien, I. Güldenpenning and M. Weigelt declare that they have no competing interests.

: Each participant gave informed consent to participate and received course credits. All rights of the participants were protected, and all experiments were carried out according to the seventh revision (Fortaleza) of the 1964 Declaration of Helsinki by the World Medical Association (WMA). This research was also reviewed and approved by the Ethics Committee of the University Paderborn. For images or other information within the manuscript which identify patients, consent was obtained from them and/or their legal guardians.