AUTHOR=Swee Du Soon , Gan Earn H. TITLE=Late-Onset Hypogonadism as Primary Testicular Failure JOURNAL=Frontiers in Endocrinology VOLUME=10 YEAR=2019 URL=https://www.frontiersin.org/journals/endocrinology/articles/10.3389/fendo.2019.00372 DOI=10.3389/fendo.2019.00372 ISSN=1664-2392