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Article History

Received: 6 September 2018

Revised: 14 December 2018

Accepted: 22 January 2019

First Online: 22 February 2019

Compliance with ethical standards

:

: The scientific guarantor of this publication is Michael J. Thali.

: The authors of this manuscript declare no relationships with any companies, whose products or services may be related to the subject matter of the article.

: No complex statistical methods were necessary for this paper. The authors have sufficient statistical understanding.

: Written informed consent was obtained from all subjects (patients) in this study.

: Institutional Review Board approval was obtained for the publishing of case-related, forensic data (Ethics Committee of the Canton of Zurich, KEK ZH-Nr. 15-0686).

: • prospective• experimental• performed at one institution