Article History
Received: 27 January 2021
Accepted: 5 May 2021
First Online: 20 May 2021
Change Date: 31 October 2021
Change Type: Update
Change Details: Open access funding note missed in the original publication. Now, it has been added in the Funding section.
Declarations
:
: The study was approved by the ethics committee of the University of Oldenburg (reference number 96/2015) and received a positive vote from the national school authorities. Informed consent and written parental permission were obtained.
: Not applicable.
: The authors declare that they have no competing interests.