“…A total of 13 trials (with 14 references) involving 1,677 women were included [Dong ( 17 ), Endrikat et al ( 18 ), Gupta et al ( 19 , 20 ), Irvine et al ( 21 ), Kaunitz et al ( 22 ), Kavasoglu et al ( 23 ), Kiseli et al ( 24 ), Liu ( 25 ), Malik et al ( 26 ), Reid and Susanna ( 27 ), Shabaan et al ( 28 ), Zhao and Hongyan ( 29 ), and Zhong et al ( 30 )]. Overall, 10 single-center trials were included, of which four were conducted in China ( 17 , 25 , 29 , 30 ) and the remaining six were conducted in Scotland ( 21 ), Turkey ( 24 ), the United Kingdom ( 27 ), Pakistan ( 26 ), and Egypt ( 28 ). The remaining three multicenter trials ( 18 , 20 , 22 ) recruited participants from Canada, the United Kingdom, the United States, and Brazil.…”