AUTHOR=Qiao Yongfeng , Wang Xiaoqin , Ma Yanfen , Hu Jian 

TITLE=Variations in vitamin D status among Chinese children aged 1–6 years during the COVID-19 pandemic

JOURNAL=Frontiers in Public Health

VOLUME=13

YEAR=2025

URL=https://www.frontiersin.org/journals/public-health/articles/10.3389/fpubh.2025.1514355

DOI=10.3389/fpubh.2025.1514355

ISSN=2296-2565