“…Sample size varied between 20 and 376 participants. (Hickson, Worrall, & Scarinci, 2007) and chronic pain (Trompetter, Bohlmeijer, Veehof, & Schreurs, 2014) (Addley et al, 2014;Bolier, Haverman, Kramer, et al, 2013;Bolier et al, 2014;Borness et al, 2013;Fava, Rafanelli, Cazzaro, Conti, & Grandi, 1998a;Fava et al, 2005;Fledderus, Bohlmeijer, Pieterse & Schreurs, 2012;Hickson et al, 2007;Korte et al, 2012;Pots, Meulenbeek, Veehof, Klungers, & Bohlmeijer, 2014;Ruini et al, 2006;Ruini et al, 2009;Stein, Corte, Chen, Nuliyalu, & Wing, 2013;Tomba et al, 2010), the other 11 studies did not mention whether there was a conflict of interest.…”