Fig. 3From: Glutamatergic medications as adjunctive therapy for moderate to severe obsessive-compulsive disorder in adults: a systematic review and meta-analysisFunnel Plot graph for the studies included in the Meta-Analysis. The asymmetry in the funnel plot may be due to heterogeneity of samples. It means that a subgroup of OCD patients may benefit more from glutamatergic drugs than other groupsBack to article page