- Correspondence to Professor Carlo La Vecchia, Department of Epidemiology, Istituto di Ricerche Farmacologiche Mario Negri, Via Giuseppe La Masa,Milan 19-20156, Italy;
- Received November 1, 2012
- Revised November 6, 2012
- Accepted November 7, 2012
- First published January 7, 2013.
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