“…PD and subthreshold PD have high comorbidity with other mental disorders [lj6-9]5 and increase long-term risk of cardiovascular and other clinical disorders [10,11].The high rate of comorbidity increases the impact of PD on patients' quality of life (QOL). Costs to individuals and society include increased utilization of healthcare resources, workplace absenteeism, unhealthy attitudes and negative coping strategies, and social withdrawal [2,8,[12][13][14][15]. PD patients' perception of their lowered QOL is as significant as impaired social and occupational functioning [16].…”