Received: 12 August 2020
Accepted: 11 January 2021
First Online: 1 February 2021
Ethics approval and consent to participate
: The study protocol was approved by the local ethical review board at the University Hospital Tuebingen (project No. 164/2020BO1). During the first three months of the pandemic a waiver of informed consent was obtained from the local ethics committee due to the urgency of acquisition of clinical data. Afterwards, written informed consent was obtained from all parents/guardians, with assent from children when appropriate for their age.
: Not Applicable.