Dörrenbächer, Sandra http://orcid.org/0000-0002-8567-9651
Kray, Jutta
Funding for this research was provided by:
Deutsche Forschungsgemeinschaft (Grant DFG-IRTG-1457)
Article History
Received: 10 May 2017
Accepted: 30 May 2018
First Online: 19 June 2018
Compliance with Ethical Standards
: For all children, written informed consent from one of their parents was warranted in accordance with the protocols approved by the local ethics committee at Saarland University.
: The authors declare that they have no conflict of interest.