1Cancer Epidemiology Unit and Cancer Registries of Vaud and Neuchâtel Institut universitaire de médecine sociale et préventive, CHUV-Falaises 1 1011 Lausanne, Switzerland 2Laboratory of Epidemiology Istituto di Ricerche Farmacologiche ‘Mario Negri’ Via Eritrea 62, 20157 Milano, Italy 3Istituto di Statistica Medica e Biometria Università degli Studi di Milano Via Venezian 1, 20133 Milano, Italy Fax: (+41) 21 3230 303 E-mail: [email protected]
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