Associations between 25 hydroxyvitamin D concentration and spontaneous abortion. - Zhang, Hongping; Ding, Xingru; Hu, Xianqing; Cai, Yi-Xin; Chen, Haiying; Sun, Congcong; Chen, Jingjing; Li, Xiaoqing; Zheng, Zhenzhen; Liao, Tingting; Zhao, Na; Zhong, Mingchen; et al. (BMC Public Health, 2024)