a'Mario Negri' Institute for Pharmacological Research bInstitute of Medical Statistics and Biostatistics, University of Milan, Milan, Italy Correspondence to Professor Carlo La Vecchia, Istituto di Ricerche Farmacologiche 'Mario Negri', via Eritrea 62, 20157 Milan, Italy Tel: +39 02 3901 4527; e-mail: [email protected]
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Vecchia et al. (2007) studied this question.
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