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Article History

Received: 22 March 2018

Accepted: 24 September 2018

First Online: 11 October 2018

Ethics approval and consent to participate

: The ethics committee of the Faculty of Medicine at the University of Tübingen approved the study protocol. All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards. The participation of the study participants was voluntary. They were informed that the consent could be withdrawn at any given time without a statement of reasons and without detriment in medical care. The nature and scope of the research was explained to the study participants in written and oral form before onset of the study and their written consent was a perquisite for participation.

: Not applicable.

: The authors declare that they have no competing interests

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