AUTHOR=Zhang Xiaoni , Wang Yue , Liu Chengyong , Qin Shan , Lin Liyu , Dong Can , Wu Wenzhong , Chen Zhaoming TITLE=The dose–effect relationship between acupuncture and its effect on primary insomnia: a systematic review and meta-analysis JOURNAL=Frontiers in Psychiatry VOLUME=16 YEAR=2025 URL=https://www.frontiersin.org/journals/psychiatry/articles/10.3389/fpsyt.2025.1501321 DOI=10.3389/fpsyt.2025.1501321 ISSN=1664-0640