Gallus, S1; Fernandez, E2 3; Townsend, J4; Schiaffino, A2; Vecchia, C La1 5
1Istituto di Ricerche Farmacologiche “Mario Negri”, Via Eritrea, 62, 20157 Milan, Italy
2Catalan Institute of Oncology, 08907 Barcelona, Spain
3Department of Public Health, University of Barcelona, 08907 Barcelona, Spain
4London School of Hygiene and Tropical Medicine, WC1E 7HT London, UK
5Istituto di Statistica Medica e Biometria, Università degli Studi di Milano, 20133 Milan, Italy
Correspondence to: S Gallus. Fax.: (+39) 2 332 00231/390 01916. E-mail: [email protected]
Received 20 December 2002 Accepted 8 April 2003