“…Whereas most studies applied no explicit in-or exclusion criteria, five studies [16][17][18][19][20] that mainly focussed on the risk of recurrent diverticulitis only included a subgroup of patients such as only uncomplicated diverticulitis or only patients without colonic resection in the initial diverticulitis episode. The stage of acute diverticulitis at presentation was reported by 21 studies , rates of emergency surgery during the initial episode by 11 studies [18,24,[27][28][29]32,34,37,39,41,42], rates of percutaneous abscess drainage during the initial episode by two studies [29,32] and rates of recurrent diverticulitis by 12 studies [16][17][18][19][20]24,25,27,33,34,36,41].…”