6Markowitz ME , Sinnett M , Rosen J F. A randomized trial of calcium supplementation for childhood lead poisoning. Pediatrics, 2004, 113 (1): 34
7Dr. G. Winneke,K. -G. Hrdina,A. Brockhaus. Neuropsychological studies in children with elevated tooth-lead concentrations[J] 1982,International Archives of Occupational and Environmental Health(2):169~183