“…Thus, in total, there were 18 independent study populations included in this meta-analysis. Of the 16 studies, 4 studies conducted the comparison of perioperative outcomes of RAPN, LPN, and OPN [ 6 , 7 , 18 , 21 ], 12 studies documented their single center’s experience with RAPN versus OPN [ 6 – 10 , 12 , 16 , 18 , 19 , 21 – 23 ], 3 studies [ 11 , 17 , 20 ] involved the multicenter collaboration, and 10 studies [ 6 , 7 , 11 , 12 , 17 – 20 , 22 , 23 ] matched the two approach with renal tumor nephrometry score (RENAL or PADUA). Among the included studies, there was 2 prospective nonrandomized comparative study (level of evidence: II) [ 8 , 11 ], 3 studies retrospective analysis but prospective data collecting (level of evidence: III) [ 6 , 12 , 16 ], 9 retrospective studies compared contemporary of patients (level of evidence: III) [ 7 , 10 , 17 – 23 ], 1 retrospective study used a historical series as the control (level of evidence: IV) [ 9 ], and 1 retrospective study but a conference abstract (level of evidence: IV) [ 24 ].…”