“…From these, 18 articles published between 1995 and 2015 contributed to the systematic review, providing data on outcomes in a total of 1238 patients (range 20-233 patients per study) based on 18 defined patient cohorts (Table 1). Specific exclusions after full-text review (and after exclusion of non-English language publications) included 4 studies where the population sample was confirmed to be less than 20 patients [5,[36][37][38], 4 studies of out-of-scope procedures [9-11,39], 2 studies where data were considered a duplicate [34,40], and 10 studies where outcomes could not be segregated by eligible procedure; [12][13][14][15][16][17][18][19][20][21] other exclusion criteria were: constipation not representing an indication (n = 2) [32,41], follow-up less than 12 months (n = 5) [8,33,35,42,43], and lack of primary patient data (one international survey on 391 surgeons) [44].…”