* Department of Surgical Gastroenterology, Hvidovre University Hospital, Hvidovre, Denmark **Correspondence address: Kathrine Holte, Department of Surgical Gastroenterology, Hvidovre University Hospital, DK-2650 Hvidovre, Denmark. Received October 10, 2001; revised April 8, 2002; accepted June 7, 2002. ☆No competing interests declared.
Holte et al. (Fri,) studied this question.
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