Article: Ruiqiong Zhou, Zhenghong Zhu, Mei Dong, Zhaoyi Wang, Li Huang, Songlu Wang, Xiqian Zhang, Fenghua Liu, Nonlinear correlation between serum vitamin D levels and the incidence of endometrial polyps in infertile women, Human Reproduction, 2024;, deae241, https://doi.org/10.1093/humrep/deae241