Patients with severe depression may benefit from buspirone augmentation of selective serotonin reuptake inhibitors: results from a placebo-controlled, randomized, double-blind, placebo wash-in study - Appelberg,B.G.; Syvälahti,E.K.; Koskinen,T.E.; Mehtonen,O.P.; Muhonen,T.T.; Naukkarinen,H.H. (J Clin Psychiatry, 2001)