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Article History

Received: 27 February 2018

Revised: 26 April 2018

Accepted: 11 May 2018

First Online: 4 June 2018

Compliance with ethical standards

:

: The scientific guarantor of this publication is Malte Bongers.

: The authors of this manuscript declare relationships with the following companies: K. Nikolaou is on the speaker´s bureau of Siemens Healthcare. For the remaining no conflicting interests are declared.

: No complex statistical methods were necessary for this paper.

: Written informed consent was waived by the Institutional Review Board.

: Institutional Review Board approval was obtained.

: • retrospective• diagnostic or prognostic study• performed at one institution