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First Online: 20 December 2019

Compliance with Ethical Standards

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: No sources of funding were received for the conduct of this study or the preparation of this article.

: Gustav Kamenski, Seda Ayazseven, Anne Berndt, Waltraud Fink, Lukas Kamenski, Sonja Zehetmayer and Helene Pühringer have completed the Unified Competing Interest form (available on request from the corresponding author) and declare the following: no support from any organisation for the submitted work; no financial relationships with any organisations that might have an interest in the submitted work in the previous 3 years, and no other relationships or activities that could appear to have influenced the submitted work.

: All procedures performed in studies involving human participants were in accordance with the ethical standards of the national research committee and with the 1964 Helsinki Declaration and its later amendments or comparable ethical standards. The study was approved by the Ethics Committee of Lower Austria (ID GS1-EK-4/413-2016).

: Informed consent was obtained from all individual participants included in the study.

: All data generated or analysed during the study are included in this published article and its supplementary information files.