Acknowledgements
RECRUITMENT
We acknowledge the participating families; Henryk Szymański, Iwona Sadowska-Krawczenko, and Anna Piwowarczyk for the assistance during the recruitment phase of the study; and Carina Lagerqvist, Eva-Lotta Andersson, and Mona Svensson for the assistance with the laboratory analyses. 16S rRNA gene sequencing was performed in collaboration with FOI, and we thank Stina Bäckman for the assistance. Swedish Metabolomics Centre, Umeå, Sweden (