AUTHOR=Xu Lu , Chen Yingchun TITLE=Effects of rural-to-urban migration on healthcare utilization of middle-aged and older adults: evidence from the China health and retirement longitudinal study JOURNAL=Frontiers in Public Health VOLUME=Volume 13 - 2025 YEAR=2025 URL=https://www.frontiersin.org/journals/public-health/articles/10.3389/fpubh.2025.1576285 DOI=10.3389/fpubh.2025.1576285 ISSN=2296-2565