Comment on “A systematic review of minimally invasive surgery for retrorectal tumors”
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- 5.Wells GA, Shea B, O'Connell D, Peterson J, Welch V, Losos M, Tugwell P (2010) The Newcastle–Ottawa Scale (NOS) for assessing the quality if nonrandomized studies in meta-analyses. Ottawa Health Research Institute, Ottawa, OntarioGoogle Scholar
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