“…Thirty research teams have investigated the relationship between MFP and depression. Twenty-four of these (Mongini et al, 2007; Slade et al, 2007; Ivkovic et al, 2008; de Tommaso et al, 2009; Galli et al, 2009; Manfredini et al, 2009; Penna et al, 2009; Shibuya et al, 2009; Giannakopoulos et al, 2010; Park et al, 2010; Velly et al, 2010, 2011; Buenaver et al, 2012; Guarda-Nardini et al, 2012; Kim et al, 2012; Kindler et al, 2012; Shedden Mora et al, 2012; Yachida et al, 2012; Pelkonen et al, 2013; Cioffi et al, 2014; Klasser et al, 2014; Mladenović et al, 2014; Boggero et al, 2016; Vidaković et al, 2016) have found a significant correlation between these issues and six studies have not (Nifosì et al, 2007; Reissmann et al, 2008; Pfau et al, 2009; Manfredini et al, 2011; Pizolato et al, 2013; Calixtre et al, 2014). The quality of evidence in the first group was moderate due to the limited generalizability of the reported results, while in the second group the score was low.…”