Jwa, S. C., Ogawa, K., Kobayashi, M., Morisaki, N., Sago, H., & Fujiwara, T. (2016). Validation of a food-frequency questionnaire for assessing vitamin intake of Japanese women in early and late pregnancy with and without nausea and vomiting. J Nutr Sci.

Jwa, Seung Chik, Kohei Ogawa, Minatsu Kobayashi, Naho Morisaki, Haruhiko Sago, and Takeo Fujiwara. "Validation of a Food-frequency Questionnaire for Assessing Vitamin Intake of Japanese Women in Early and Late Pregnancy With and Without Nausea and Vomiting." J Nutr Sci 2016.

Jwa, Seung Chik, et al. "Validation of a Food-frequency Questionnaire for Assessing Vitamin Intake of Japanese Women in Early and Late Pregnancy With and Without Nausea and Vomiting." J Nutr Sci 2016.