“…Of the former, six were randomized controlled trials (Doornbos et al, 2009;Freeman et al, 2008;Llorent et al, 2003;Makrides et al, 2010;Mozurkewich et al, 2013;Rees, Austin, & Parker, 2008) and two pilot trials (Freeman et al, 2006;Marangell et al, 2004). The nine observational studies included: one ecological study (Hibbeln, 2002), a cross-sectional study (De Vriese, Christophe, & Maes, 2003), a case-control study (Browne, Scott, & Silvers, 2006), and six cohort studies (da Rocha & Kac, 2012;Markhus et al, 2013;Miyake et al, 2006;Otto, De Groot, & Hornstra, 2003;Parker et al, 2014;Strøm, Mortensen, Halldorsson, Thorsdottir, & Olsen, 2009). The included studies and the results of our quality appraisals are summarized in Table A1, while more detail on the characteristics of the studies is presented in Table A2.…”