AUTHOR=Altmäe Signe TITLE=Commentary: Uterine Microbiota: Residents, Tourists, or Invaders? JOURNAL=Frontiers in Immunology VOLUME=9 YEAR=2018 URL=https://www.frontiersin.org/journals/immunology/articles/10.3389/fimmu.2018.01874 DOI=10.3389/fimmu.2018.01874 ISSN=1664-3224