“…Two studies defined early cholecystectomy when surgery was performed “≤7 days from symptoms.”12,14 Five studies defined as early those cholecystectomies performed within 24 hours from admission9,13,16,20,21 and in addition to these, 1 study defined early as within 24 hours from admission but after more than 72 from symptoms onset 23. These 6 studies were termed together as “≤24 hours from admission.” Five studies defined as early those cholecystectomies performed within 72 hours from admission10,11,17,25,26 and were termed as “≤72 hours from admission.” Finally, 7 studies defined early cholecystectomies as those performed within 72 hours from symptoms onset and were consequently termed as “≤72 hours from symptoms” 15,18,19,22,24,27,28. Details are provided in the Table 1.…”