- Correspondence to: Dr D F Merlo Epidemiology and Biostatistics, Istituto Nazionale per la Ricerca sul Cancro, Largo Rosanna Benzi 10, 16132 Genova, Italy;
- Received February 20, 2006
- Accepted August 29, 2006
- Revised August 21, 2006
- First published June 29, 2007.
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