Causal association between circulating leukocyte characteristics and diabetic retinopathy based on two‐sample Mendelian randomization. - Wang, Yan; Gao, Yunxian; Wang, Zhiqiang; Wu, Luhua; Guo, Lixia; Zhang, Xiaoqiang; Wu, Jiaxin; Shang, Shanshan (Journal of Diabetes Investigation, 2026)