Funding for this research was provided by:
Kiwi e.V. (n/a)
Text and Data Mining valid from 2019-11-21
Received: 29 July 2019
Accepted: 11 November 2019
First Online: 21 November 2019
Ethics approval and consent to participate
: The study was approved by the local ethics committee (46/09). All participants and their legal guardians gave verbal assent and written informed consent.
: With signing the consent form, participants and their legal guardians agreed to anonymized publication of their data in scientific talks and papers.
: The authors declare that they have no competing interests.