AUTHOR=Cao Yu , Li Mingshi , Cao Wanbin , Tang Li , Chen Shenglan TITLE=Retrograde intrarenal surgery in the prone split-leg position for female upper urinary tract stones: a preliminary study of 16 cases JOURNAL=Frontiers in Surgery VOLUME=Volume 12 - 2025 YEAR=2025 URL=https://www.frontiersin.org/journals/surgery/articles/10.3389/fsurg.2025.1562484 DOI=10.3389/fsurg.2025.1562484 ISSN=2296-875X