Varenicline Effects on Smoking, Cognition, and Psychiatric Symptoms in Schizophrenia: A Double-Blind Randomized Trial. oleh Robert C Smith, Revital Amiaz, Tian-Mei Si, Lawrence Maayan, Hua Jin, Sylvia Boules, Henry Sershen, Chunbo Li, Juanjuan Ren, Yanhong Liu, Mary Youseff, Abel Lajtha, Alessandro Guidotti, Mark Weiser, John M Davis