This three site , @-week , double-blind randomized controlled trial compared the relative benefits of three strategies for patients remaining symptomatic ( Liebowitz Social Anxiety Scale -LSB- LSAS -RSB- score > @ ) after a @-week trial of sertraline alone : the addition of up to @ mg/day of clonazepam ( sertraline plus clonazepam ) , a switch to up to @ mg/day of venlafaxine , or prolonged sertraline treatment with placebo ( sertraline plus placebo ) .