Symptom dimensions are associated with age of onset and clinical course of obsessive–compulsive disorder - Kichuk, Stephen A.; Torres, Albina R.; Fontenelle, Leonardo F.; Rosário, Maria Conceição; Shavitt, Roseli G.; Miguel, Eurípedes C.; Pittenger, Christopher; Bloch, Michael H. (Progress in Neuro-Psychopharmacology and Biological Psychiatry, 2013)