The Sigma-trial protocol: a prospective double-blind multi-centre comparison of laparoscopic versus open elective sigmoid resection in patients with symptomatic diverticulitis by Lacy Antonio M, Heres Piet, Bergamaschi Roberto, Bemelman Willem A, de Lange Elly SM, Veenhof Alexander AFA, Klarenbeek Bastiaan R, van den Broek Wim T, van der Peet Donald L, Cuesta Miguel A

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