You have to register, but here’s the link (and registration, in this case, is free - oh to be able to spend that kind of bucks for the clinical info…)
You don’t have to register to read the article cited by hedra. It was produced by the federal government, is not copyrighted, and is posted at CDC’s website on the Morbidity and Mortality Weekly Report (MMWR) pages at http://www.cdc.gov/mmwr/
Look for "Folate Status in Women of Childbearing Age —
United States, 1999 (MMWR October 27, 2000; 49(42);962-5.