1. Department of Epidemiology; IRCCS - Istituto di Ricerche Farmacologiche Mario Negri; Milan Italy
2. Division of Epidemiology and Biostatistics; European Institute of Oncology; Milan Italy
3. Clinical Nutrition and Risk Factor Modification Center; St. Michael's Hospital; Toronto ON Canada
4. Department of Clinical Sciences and Community Health; Università degli Studi di Milano; Milan Italy