Funding for this research was provided by:
Charité – Universitätsmedizin Berlin
Kronprinsessan Lovisas förening för barnasjukvård (2018-00429)
Received: 19 April 2021
Accepted: 26 May 2021
First Online: 8 June 2021
: The study protocol was approved by the research Ethics Committee of Charité – Universitätsmedizin Berlin (reference number ES2/130/16). All study procedures were in accordance with the ethical standards of the Declaration of Helsinki. Written informed consent was obtained from all study participants and their guardians.
: Not applicable.
: The authors declare that they have no conflict of interest.