Maternal periconception serum vitamin B12 concentration and risk of preterm birth: a prospective cohort study
Yuanzhou Peng, Yi Zhang, Xiaotian Chen, Yalan Dou, Jun Huang, Xiaohua Zhang, Guoying Huang, Xiangfeng Lu, Weili Yan
BMJ Open May 2025, 15 (5) e100064; DOI: 10.1136/bmjopen-2025-100064