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Article History

Received: 6 August 2020

Accepted: 10 February 2021

First Online: 8 March 2021

Change Date: 19 May 2021

Change Type: Update

Change Details: The funding note to add is the following:Open Access funding enabled and organized by Projekt DEAL.

Ethics approval and consent to participate

: The Ethics Committee of the University of Cologne ruled that no formal ethics approval was required in this particular case. All participants gave their written informed consent to collect their data in anonymous form and to publish the data in group format. None of the participants was under 16 years old (note that parents of ill and healthy children participated in the study, but not the children themselves).

: Not applicable: The manuscript contains no images or other identifiable personal or clinical details of individual participants.

: The authors declare no conflict of interests.