1. U.S. Department of Health and Human Services: The Surgeon General's 1990 Report on The Health Benefits of Smoking Cessation, Washington, DC, US, G.P.P., 1990.
2. Garfinkel L, Stellman SD. Cigarette smoking among physicians, dentists, and nurses. CA, 1986;36: 2?8.
3. Doll R, Peto R. Mortality in relation to smoking: 20 years' observations on male British doctors. BMJ, 1976;2: 1525?1536.
4. Fiore MC, Novotny TE, Pierce JP, Hatziandreu EJ, Patel KM, Davis RM. Trends in cigarette smoking in the United States. The changing influence of gender and race. JAMA 1989;261: 49?55.
5. ISTAT (Instituto Centrale di Statistica): Indagine statistica sulle condizioni di salute della popolazione e sul ricorso ai servizi sanitari, Novembre 1983. Note e Relazioni 1986, n. 1.