1. Department of Epidemiology; IRCCS - Istituto di Ricerche Farmacologiche “Mario Negri”; Milan Italy
2. Department of Statistics; Unit di Biostatistics and Epidemiology, Università Milano-Bicocca; Milan Italy
3. Department of Sciences for the Health Promotion and Mother and Child Care “G. D'Alessandro”; Hygiene Section, University of Palermo; Palermo Italy
4. Unità Organizzativa Governo dei Dati, delle Strategie e Piani del Sistema Sanitario; Regione Lombardia; Milan Italy
5. Department of Clinical Sciences and Community Health; Università degli Studi di Milano; Milan Italy