Pabel, Sven-Olav
Freitag, Franziska
Hrasky, Valentina
Zapf, Antonia
Wiegand, Annette
Article History
Received: 22 February 2017
Accepted: 12 December 2017
First Online: 9 March 2018
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.
: All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards. The study was approved by the local ethics committee (No.13/1/16).
: Informed consent was obtained from children and their parents or legal guardians.