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First Online: 15 June 2020

Compliance with ethical guidelines

:

: C. Angerer and I. Königsrainer declare that they have no competing interests.

: All procedures performed in studies involving human participants or on human tissue were in accordance with the ethical standards of the institutional and/or national research committee and with the 1975 Helsinki declaration and its later amendments or comparable ethical standards. A statement regarding the retrospective analysis of the data is available: no involvement or vote by the Ethics Committee of the State of Vorarlberg was required to conduct the study. Informed consent was obtained from all individual participants included in the study.