aUnitá di Chirugia, Dipartmento di Fisiopatologia Clinica, Universitá Degli Studi di Firenze, Firenze, Italy Correspondence address: Giacomo Batignani, MD, Unitá di Chirurgia, Dipartimento di Fisiopatologia Clinica, Viale G.B. Morgagni, 85, 50134 Firenze, Italy Submitted September 7, 1999; revised and accepted December 6, 1999. Presented as a video at the European Congress of the International Hepato-Pancreato-Biliary Association, Budapest, Hungary, May, 1999. 1No competing interests declared.
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