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European Hernia Society in Edinburgh on May 31st 2014. The manuscript was subsequently written by the  rst author in a uniform manner for all Key Questions and send for review and agreement by all co-authors. Prior to submission, the manuscript of the guidelines was externally reviewed by experts and evaluated using the AGREE II instrument.
Results
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The results of the searches are shown in the PRISMA  ow diagram in Figure 1. From the 97 records detected by the SIGN process, 69 records were excluded based on the title and abstract as not being relevant to the guidelines. The remaining 28 systematic reviews(4, 23-49) were assessed by full text for their relevance to the Key Questions and if retained were assessed qualitatively using the SIGN checklist No 1(19). Additional searches on PubMed and by checking the references of all manuscripts were performed by the members of the Guidelines Development Group assigned to each Key Question. Relevant studies published up until April 2014 were included to provide the Summary of Evidence tables.
EHS guidelines
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