Hemoglobin, lead exposure, and intelligence quotient: effect modification by the DRD2 Taq IA polymorphism.
Roy A, Hu H, Bellinger DC, Mukherjee B, Modali R, Nasaruddin K, Schwartz J, Wright RO, Ettinger AS, Palaniapan K, et al. Environ Health Perspect. 2011 Jan; 119(1):144-9.