“…Seven were conducted in Brazil, four in the United States and one each in Scotland, the UK, Russia, Puerto Rico, the Czech Republic, India, Nigeria, Switzerland and Taiwan. Eleven studies were classified as being of very low quality (Ojofeitimi et al, 2000;Weng et al, 2003;Bartington et al, 2006;Vieira et al, 2006;Rivera-Lugo et al, 2007;Rosenberg et al, 2008;Silva et al, 2008;Dabritz et al, 2009;Declercq et al, 2009;Narchi et al, 2009;Shilpa et al, 2009), six of low quality (Helsing et al, 2002;Venancio et al, 2002;Broadfoot et al, 2005;Merewood et al, 2005;Mydlilova et al, 2009;Sampaio et al, 2011) and three of moderate quality Merten et al, 2005;Venancio et al, 2012). Studies' description and findings.…”