BORAN, A. M.; AL-BASHIR, N. A.; AL-KHATIB, A. J.; QATTAN, I. T.; ALANAZI, S. A.; MASSADEH, A. M. INVESTIGATING THE RELATIONSHIP BETWEEN MENTAL RETARDATION AND LEAD INTOXICATION. European Scientific Journal, ESJ, v. 9, n. 6, 28 Feb. 2013.