Istituto di Ricerche Farmacologiche ‘Mario Negri’, via Eritrea 62, 20157 Milano, Italy and Istituto di Statistica Medica e Biometria, Università degli Studi di Milano, via Venezian 1, 20133 Milano, Italy Correspondence to: Istituto di Ricerche Farmacologiche ‘Mario Negri’, via Eritrea 62, 20157 Milano, Italy. Fax: 00 39 02 3320 0231 E-mail: [email protected] Received 30 June 2003 Accepted 14 July 2003
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