“…The full text of sixteen studies was available, and the basic characteristics of included studies were shown in Table 1 . There was a moderate risk bias for the RCTs: four studies mentioned random sequence regeneration [ 17 , 18 , 23 , 27 ], six studies mentioned allocation concealment [ 17 , 18 , 23 – 26 ], two studies used the blinding of participants [ 17 , 18 ], one study used observed blinding [ 17 ], eight studies reported complete outcome [ 17 , 18 , 20 , 21 , 23 , 24 , 26 , 27 ], and nine studies reported all outcome date without reporting bias [ 17 , 18 , 20 , 21 , 23 – 27 ]. For retrospective cohort studies, three studies had 9 scores [ 9 , 10 , 28 ], two studies had 8 scores [ 15 , 19 ], and two studies had 7 scores [ 16 , 22 ].…”