Whitehead AS, Gallagher P, Mills JL, Kirke PN, Burke H, Molloy AM, Weir DG, Shields DC, Scott JM. 1995. A genetic defect in 5, 10 methylenetetrahydrofolate reductase in neural tube defects. Q J Med 88:763–766.
Whitehead VM. 1973. Polygammaglutamyl metabolites of folic acid in human liver. Lancet 1:743–745.
Whitehead VM. 1986. Pharmacokinetics and physiological disposition of folate and its derivatives. In: Blakely RL, Whitehead VM, eds. Folates and Pterins, Vol. 3. New York: John Wiley & Sons. Pp. 177–205.
Wilcken DE, Wilcken B. 1976. The pathogenesis of coronary artery disease. A possible role for methionine metabolism. J Clin Invest 57:1079–1082.
Wilcken DE, Wang XL, Sim AS, McCredie RM. 1996. Distribution in healthy and coronary populations of the methylenetetrahydrofolate reductase (MTHFR) C677T mutation. Arterioscler Thromb Vasc Biol 16:878–882.
Will JJ, Mueller JF, Brodine C, Kiely CE, Friedman B, Hawkins VR, Dutra J, Vilter RN. 1959. Folic acid and vitamin B12 pernicious anemia. Studies on patients treated with these substances over a ten-year period. J Lab Clin Med 53:22–38.
Willard JE, Lange RA, Hillis LD. 1992. The use of aspirin in ischemic heart disease. N Engl J Med 327:175–181.
Willoughby ML. 1967. An investigation of folic acid requirements in pregnancy. II. Br J Haematol 13:503–509.
Willoughby ML, Jewell FJ. 1966. Investigation of folic acid requirements in pregnancy. Br Med J 2:1568–1571.
Willoughby ML, Jewell FG. 1968. Folate status throughout pregnancy and in postpartum period. Br Med J 4:356–360.
Wilson JG. 1973. Environment and Birth Defects. New York: Academic Press
Witter FR, Blake DA, Baumgardner R, Mellits ED, Niebyl JR. 1982. Folate, carotene, and smoking. Am J Obstet Gynecol 144:857.
Wouters MG, Boers GH, Blom HJ, Trijbels FJ, Thomas CM, Borm GF, Steegers-Theunissen RP, Eskes TK. 1993. Hyperhomocysteinemia: A risk factor in women with unexplained recurrent early pregnancy loss . Fertil Steril 60:820– 825.
Wu A, Chanarin I, Slavin G. Levi AJ. 1975. Folate deficiency in the alcoholic—its relationship to clinical and haematological abnormalities, liver disease and folate stores. Br J Haematol 29:469–478.
Yen IH, Khoury MJ, Erickson JD, James LM, Waters GD, Berry RJ. 1992. The changing epidemiology of neural tube defects: United States, 1968–1989. Am J Dis Child 146:857–861.
Young SN, Ghadirian AM. 1989. Folic acid and psychopathology. Prog Neuropsychopharmacol Biol Psychiatry 13:841–863.
Zalusky R, Herbert V. 1961. Megaloblastic anemia in scurvy with response to 50 micrograms of folic acid daily. N Engl J Med 265:1033–1038.
Ziegler RG, Brinton LA, Hammon RF, Lehman HF, Levine RS, Mallin K, Norman SA, Rosenthal JF, Trumble AC, Hoover RN. 1990. Diet and risk of invasive cervical cancer among white women in the United States. Am J Epidemiol 132:432–445.
Ziegler RG, Jones CJ, Brinton LA, Norman SA, Mallin K, Levine RS, Lehman HF, Hammon RF, Trumble AC, Rosenthal JF. 1991. Diet and risk of in situ cervical cancer among white women in the United States. Cancer Causes Control 2:17– 29.
Zimmerman J. 1990. Folic acid transport in organ-cultured mucosa of human intestine. Evidence for distinct carriers. Gastroenterology 99:964–972.