Received: 31 October 2019
Accepted: 1 April 2020
First Online: 16 April 2020
Ethics approval and consent to participate
: Written general informed consent was obtained from all parents of patients included in the study. This study was approved by the Ethics Committee of Canton Zurich, Switzerland, which is part of the Swiss Ethics Committees on research involving humans (BASEC-Nr. 2017–00773).
: Not applicable.
: The authors declare that they have no competing interests.