Use of an oral/intravenous dual-label stable-isotope protocol to determine folic acid bioavailability from fortified cereal grain foods in women

Finglas P. M., Witthoft C. M., Vahteristo L ., Wright A. J. A., Southon S., Mellon F. A., Ridge B., Maunder P.. (2002)

Journal of Nutrition, 132, 936-939