“…The characteristics of the studies included are shown in Table 1 . There were 5 RCTs [ 14 , 20 , 21 , 25 , 28 ] (level of evidence: 2b) [ 29 ]; 8 retrospective studies [ 15 , 16 , 18 , 19 , 22 , 24 , 26 , 27 ] and 2 prospective studies (level of evidence: 2b–3b) [ 17 , 23 ]. As for surgical procedures, 10 studies compared SSLF with ASC [ 15 , 16 , 18 , 20 – 25 , 28 ], 4 compared SSLF with LSC [ 14 , 17 , 19 , 26 ], and 1 compared ASC, LSC, and SSLF [ 27 ].…”