Neurochemistry of obsessive-compulsive disorder: A combined PET and MRS study. - Lawrence S. Kegeles; H. Blair Simpson; Xiaoyan Xu; Xiangling Mao; Rena Staub; James Bender; Olga Medina; Mark Slifstein; Dikoma C. Shungu; Anissa Abi-Dargham (NeuroImage, 2010)