“…On the basis of this classification, risk professions can be divided into two groups, the first group being made up of professions that involve inhalation of solid particulates, [Roscoe et al, 1989;Finkelstein, 1995;Qing-Sheng et al, 1995;Robinson et al, 1995;Stern et al, 1995;Firth et al, 1996; Robinson et al, 1996;Rousteenoja et al, 1996;Wang et al, 1996;Lubin and Boice, 1997; Andersen et al, 1999;González and Agudo, 1999;Pezzotto and Poletto, 1999] and the second of professions that involve exposure to organic chemical compounds [Guberan et al, 1992;Armstrong et al, 1994;Sorahan et al, 1994;Finkelstein, 1995;Qing-Sheng et al, 1995;De Stefani et al, 1996;Firth et al, 1996;Leigh, 1996;Jakobsson et al, 1997;Lynge et al, 1997;Ward et al, 1997;Grimsrud et al, 1998;Soll-Johanning et al, 1998; Andersen et al, 1999;Pezzotto and Poletto, 1999;Steenland and Palu, 1999] or radiation [Ritz, 1999].…”