Serum levels and activity of indoleamine2,3-dioxygenase and tryptophanyl-tRNA synthetase and their association with disease severity in patients with chronic kidney disease. - Bao, Yu-Shi; Ji, Ying; Zhao, Shi-Lei; Ma, Lin-Lin; Xie, Ru-Juan; Na, Shi-Ping (Biomarkers, 2013)