Non-linear relationship between Dietary Inflammatory Index and constipation: threshold identification and insights from NHANES [2005–2010] and Mendelian randomization analysis - Wei, Shuxun; Qian, Jin; Zou, Minghao; Qian, Ye; Zhou, Wenxuan; Gu, Yangjuan; Tang, Lili; Liu, Hui; Zhang, Chengjing (Translational Gastroenterology and Hepatology, 2025)