Received: 20 May 2021
Accepted: 15 November 2021
First Online: 18 December 2021
Change Date: 15 May 2022
Change Type: Update
Change Details: The Funding section has been updated.
: Stool samples were obtained from healthy volunteers of age after informed and written consent. An ethics approval is deemed unnecessary according to the statement given in the Drucksache 15/2849 of the German Bundestag about § 41 Abs. 2 Nr. 2 S. 1 and 2 Arzneimittelgesetz.
: Persons providing stool samples are entirely unidentifiable and there are no details on individuals reported within the manuscript. Thus, consent for publication is not applicable.
: KN has ongoing scientific collaborations with HiPP GmbH & Co. Vertrieb KG (Pfaffenhofen, Germany). All other authors declare that they have no competing interests.