Song, S. J., Zhou, L., Si, S., Liu, J., Zhou, J., Feng, K., . . . Zhang, W. (2013). The High Prevalence of Vitamin D Deficiency and Its Related Maternal Factors in Pregnant Women in Beijing. Public Library of Science.

Song, Shu Jun, Ling Zhou, Shaoyan Si, Junli Liu, Jinlian Zhou, Kai Feng, Jie Wu, ja Wenying Zhang. The High Prevalence of Vitamin D Deficiency and Its Related Maternal Factors in Pregnant Women in Beijing. Public Library of Science, 2013.

Song, Shu Jun, et al. The High Prevalence of Vitamin D Deficiency and Its Related Maternal Factors in Pregnant Women in Beijing. Public Library of Science, 2013.