This pilot study sought to compare the feasibility and acceptability of 60-minute , twice-per-week sessions of YM for 2 months with those of no-contact control and to evaluate the effects of the intervention on QOL ( according to the Short Form-36 , Perceived Stress Scale [ PSS ] , and Impact of Events Scale [ IES ] ) and salivary cortisol and dehydroepiandrosterone sulfate ( DHEA-S ) among PLWH who use crack cocaine .