Fingerhut M, Nelson DI, Driscoll T, Concha-Barrientos M, Steenland K, Punnett L, Pr?ss-Ust?n A, Leigh J, Corvalan C, Eijkemans G, Takala J. The contribution of occupational risks to the global burden of disease: summary and next steps. Med Lav. 2006 Mar-Apr; 97(2):313-21.