AUTHOR=Song Gao TITLE=Vitamin D deficiency and polycystic ovary syndrome: an opinion and positioning article JOURNAL=Frontiers in Nutrition VOLUME=Volume 12 - 2025 YEAR=2025 URL=https://www.frontiersin.org/journals/nutrition/articles/10.3389/fnut.2025.1602472 DOI=10.3389/fnut.2025.1602472 ISSN=2296-861X