AUTHOR=Bühler Klaus F. TITLE=Commentary: Management Strategies for POSEIDON Groups 3 and 4 JOURNAL=Frontiers in Endocrinology VOLUME=10 YEAR=2020 URL=https://www.frontiersin.org/journals/endocrinology/articles/10.3389/fendo.2019.00920 DOI=10.3389/fendo.2019.00920 ISSN=1664-2392