“…In the 22 observational studies (Al‐Obaidy & Al‐Youzbaki, 2014; Asare et al, 2014; Avila et al, 1996; Barreiros et al, 2010; Bender et al, 2013; Cursino et al, 2018; Hameed et al, 2001; Haroon & Naveed, 2014; Kurunmaki, 1983; Lizarelli et al, 2009; Mia et al, 2004; Morin‐Papunen et al, 2008; Odutayo et al, 2015; Ortayli et al, 2001; Oyelola, 1993; Shen et al, 1994; Sivin et al, 1981; Taneepanichskul et al, 1999; Wilson et al, 1984; Xiang et al, 2007; Yasmin et al, 1993; Yildirim et al, 1997) (12 studies including controls, 2 including OC users, and 8 studies including both comparators), a total of 6934 patients were included with the mean age ranging from 22.9 to 42.2 years. Study publication dates ranged from 1983 to 2015 with the majority of studies published after 2000.…”