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Article History

Received: 4 December 2018

Accepted: 9 April 2019

First Online: 27 April 2019

Ethics approval and consent to participate

: All procedures conducted in this study were in accordance with the ethical standards of the institutional and research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards. This study has the committee reference number 14–101-0095 and was approved by the local Ethics Committee of the University Medical Center Regensburg. All study participants gave their written informed consent.

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

: The authors declare that they have no competing interests.

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