“…Furthermore, the literature showed that treatment of depression had positive outcome on patients' prognosis and quality of life, and that depressed mood lowered the force needed to cope with the chronic diseases, decreased tolerability of physical symptoms, and increased psychosocial disturbances (Frasure-Smith & Lespérance, 2006). Previous studies also show that depression have been linked with chronic illnesses (Honyashiki, Ferri, Acosta, Guerra, & Huang, 2011), and that patients' psychological difficulties and health care professional competency related to psychological follow up care have been linked to increased morbidity, mortality, and expenditure of health services (Wang, Demler, Olfson, Pincus, Wells, & Kessler, 2006;Sullivan, Simon, Spertus, & Russo, 2002). According to Katon (2003), depression contributed to 50% increase in health care cost medical illnesses.…”