AUTHOR=von Mutius Erika 

TITLE=The “Hygiene Hypothesis” and the Lessons Learnt From Farm Studies

JOURNAL=Frontiers in Immunology

VOLUME=12

YEAR=2021

URL=https://www.frontiersin.org/journals/immunology/articles/10.3389/fimmu.2021.635522

DOI=10.3389/fimmu.2021.635522

ISSN=1664-3224