“…6,7,15,16,21,28−41 The eligible studies were published between 2010 and 2020, all of which were retrospective studies, and none was a randomized controlled study; all studies were comparator studies. 6,7,15,16,21,28−41 Nearly a third of the studies were from Europe (n=8 [42.1%]), 6,7,15,28,32,34,35,38 followed by Japan (n=4 [21.1%]), 16,36,37,40 China (n=3 [15.8%]), 29,33,39 Korea (n=1 [5.3%]), 21 Israel (n=1 [5.3%]), 30 Canada (n=1 [5.3%]), 31 and Australia (n=1 [5.3%]). 41 All 19 studies examined the effect of endometriosis on the incidence of placenta previa (Table 1).…”