AUTHOR=Zhang Yongchao , Fan Wenhao , Wang Yichang , Dong Tengjing , Liu Deding , Shao Yiming TITLE=The association between primary frozen shoulder and serum lipids may be overestimated: evidence based on retrospective observational studies and Mendelian randomization JOURNAL=Frontiers in Endocrinology VOLUME=15 YEAR=2025 URL=https://www.frontiersin.org/journals/endocrinology/articles/10.3389/fendo.2024.1363018 DOI=10.3389/fendo.2024.1363018 ISSN=1664-2392