“…Most evidence regarding the effectiveness of PPIs comes from studies with non-clinical samples (Bolier et al, 2013;Sin & Lyubomirsky, 2009), but there are some initial studies exploring the effectiveness of PPIs in clinical populations (Chakhssi, Kraiss, Sommers-Spijkerman, & Bohlmeijer, 2018). Studies to date indicate the effectiveness of PPIs when dealing with depression (Carr & Finne-Psychology gan, 2015;, depression comorbid with long-term conditions (Cohn, Pietrucha, Saslow, Hult, & Moskowitz, 2014;D'raven, Moliver, & Thompson, 2015), psychosis (Riches, Schrank, Rashid, & Slade, 2016;Schrank, Brownell, Jakaite, Larkin, Pesola, Riches et al, 2016), schizophrenia (Meyer, Johnson, Parks, Iwanski, & Penn, 2012), suicidality (Huffman, DuBois, Healy, Boehm, Kashdan, Celano et al, 2014), addiction problems (Krentzman, 2013) and with sub-clinical mental health difficulties such as depressive symptoms (Guo, Zhang, Plummer, Lam, Cross, & Zhang, 2017).…”