aDepartments of Epidemiology, Istituto di Ricerche Farmacologiche Mario Negri bOccupational Health, Università di Milano, Italy Correspondence to Professor Carlo La Vecchia, MD, Istituto Mario Negri, Via G. La Masa, 19, Milano 20156, Italy Tel: +39 02 3901 4527; fax: +39 02 3320 02321; e-mail: [email protected] Received February 21, 2011 Accepted February 21, 2011
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