APA

Liu J., Xie J., Li Z., Greene N. D. E. & Ren A. (20191025). Sex differences in the prevalence of neural tube defects and preventive effects of folic acid (FA) supplementation among five counties in northern China: results from a population-based birth defect surveillance programme. : BMJ open.

Chicago

Liu Jufen, Xie Jing, Li Zhiwen, Greene Nicholas D E and Ren Aiguo. 20191025. Sex differences in the prevalence of neural tube defects and preventive effects of folic acid (FA) supplementation among five counties in northern China: results from a population-based birth defect surveillance programme. : BMJ open.

Harvard

Liu J., Xie J., Li Z., Greene N. D. E. and Ren A. (20191025). Sex differences in the prevalence of neural tube defects and preventive effects of folic acid (FA) supplementation among five counties in northern China: results from a population-based birth defect surveillance programme. : BMJ open.

MLA

Liu Jufen, Xie Jing, Li Zhiwen, Greene Nicholas D E and Ren Aiguo. Sex differences in the prevalence of neural tube defects and preventive effects of folic acid (FA) supplementation among five counties in northern China: results from a population-based birth defect surveillance programme. : BMJ open. 20191025.