Specific metabolites in the medial prefrontal cortex are associated with the neurocognitive deficits in schizophrenia: A preliminary study. - Yukihiko Shirayama; Takayuki Obata; Daisuke Matsuzawa; Hiroi Nonaka; Yoko Kanazawa; Eiji Yoshitome; Hiroo Ikehira; Kenji Hashimoto; Masaomi Iyo (NeuroImage, 2010)