Funding for this research was provided by:
Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung (32003B_153273)
Text and Data Mining valid from 2019-02-07
Received: 29 September 2018
Revised: 17 January 2019
Accepted: 17 January 2019
First Online: 7 February 2019
Compliance with ethical standards
: The authors declare that they have no conflict of interest.
: Informed consent was obtained from all individual participants included in the study. Parents provided written informed consent for their participating child and children consented orally.