Funding for this research was provided by:
Received: 16 January 2021
Accepted: 19 May 2021
First Online: 3 June 2021
: The study was approved by the Institutional Review Board of Universitaetsmedizin Greifswald with the case number BB 055/17. All participants and their parents or legal guardians consented orally and written to participation in this study.
: Not applicable.
: The authors declare that they have no competing interests.