Funding for this research was provided by:
Signal Iduna Health Fund
Article History
Received: 27 November 2017
Accepted: 9 September 2018
First Online: 26 September 2018
Ethics approval and consent to participate
: The study was conducted according to the guidelines of the declaration of Helsinki. The ethical approval was obtained from the Ethical Board of the University Clinic of Regensburg. Parental consent was obtained in written format.
: Not applicable.
: The authors declare that they have no competing interests.
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