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a 1° Institute of General Surgery, University of Padua, Padua, Italy *Correspondence address: Maria Rosa Pelizzo, MD, 1° Institute of General Surgery, University of Padua, Via Giustiniani 2, 35128 Padua, Italy Received January 16, 1998; revised May 11, 1998; accepted May 13, 1998.
Pelizzo et al. (Tue,) studied this question.