“…2), 11 studies were considered to have a low risk of bias, of which 5 were RCTs (9, 19-22), 2 CCTs (23, 24), and 4 PCSs (10,11,25,26). Seven studies were considered to have a high risk of bias, of which 4 were RCTs (6,8,27,28) and 3 PCSs (5,7,13).…”