Funding for this research was provided by:
Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung (32003B_141201)
Fondation Botnar (6066)
Hartmann Müller Foundation (1912)
Text and Data Mining valid from 2020-02-28
Received: 5 July 2019
Accepted: 29 January 2020
First Online: 28 February 2020
Ethics approval and consent to participate
: The research protocol was approved by the local ethics committee and carried out in accordance with the recommendations of the ordinance on human research. All parents gave written informed consent in accordance with the Declaration of Helsinki.
: The authors declare that they have no competing interests.