Serum brain-derived neurotrophic factor levels as a novel biological marker for the activities of psychiatric symptoms in systemic lupus erythematosus. - Ikenouchi-Sugita, Atsuko; Yoshimura, Reiji; Okamoto, Tatsuya; Umene-Nakano, Wakako; Ueda, Nobuhisa; Hori, Hikaru; Katsuki, Asuka; Saito, Kazuyoshi; Tanaka, Yoshiya; Nakamura, Jun (World Journal of Biological Psychiatry, 2010)