Lead exposure, B vitamins, and plasma homocysteine in men 55 years of age and older: the VA normative aging study.
Bakulski KM, Park SK, Weisskopf MG, Tucker KL, Sparrow D, Spiro A, Vokonas PS, Nie LH, Hu H, Weuve J. Lead exposure, B vitamins, and plasma homocysteine in men 55 years of age and older: the VA normative aging study. Environ Health Perspect. 2014 Oct; 122(10):1066-74.