Laparoscopic and open repair for perforated duodenal ulcer: single-center experience by Suren Agho Stepanyan, Areg Artak Petrosyan, Hayk Hovhannes Safaryan, Hayk Henrik Yeghiazaryan, Andranik Yuri Aleksanyan, Vahe Mkrtich Hakobyan, Karen Tigran Papazyan, Mkrtich Hamlet Mkrtchyan

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