Istituto di Ricerche Farmacologiche 'Mario Negri', Via Eritrea 62, 20157 Milano, and Istituto di Statistica Medica e Biometria, Università di Milano, Via Venezian 1, 20133 Milano, Italy Fax: (+39) 02 3546 277. E-mail: [email protected] *This paper was an invited presentation of the 18th Annual Symposium of European Cancer Prevention Organisation (ECP): Precancerous lesions of the digestive tract held in Maastricht, The Netherlands, 12–14 October, 2000
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