AUTHOR=Jia Wanwen TITLE=The health effect of relaxing entry regulation for private hospitals and its nonlinear characteristics: evidence from China JOURNAL=Frontiers in Public Health VOLUME=Volume 13 - 2025 YEAR=2025 URL=https://www.frontiersin.org/journals/public-health/articles/10.3389/fpubh.2025.1432806 DOI=10.3389/fpubh.2025.1432806 ISSN=2296-2565