Funding for this research was provided by:
Sanofi-Aventis GmbH, Amgen GmbH, AOP Orphan Pharmaceuticals AG and Meda Pharma GmbH.
Received: 23 January 2018
Accepted: 17 June 2019
First Online: 25 June 2019
Ethics approval and consent to participate
: We received Institutional Review Board approval from the Medical University Vienna (MUV, EC Nr: 2019/2015). All parents were informed and provided their written informed consent.
: Not applicable.
: The authors declare that they have no competing interests.