1 Epidemiology Unit. Aviano Cancer Center, Via Pedemontana, Oct 12. 33081 Aviano (PN). Italy. 2 European Bureau for Action on Smoking Prevention (BASP). 27 Rue du College. B-1050 Brussels, Belgium Correspondence to: S Franceschi Fax: (+39) 434 659 222.
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Franceschi et al. (1995) studied this question.