In the affiliation of the authors of the original article “Association of neopterin as a marker of immune system activation and juvenile rheumatoid arthritis activity” (J Pediatr (Rio J). 2015;91(4):352-357), where it reads:

Mones M. Abu Shadya, Hanan A. Fathyb, Alaa Alia, Eman R. Younessc, Gihan A. Fathya

a Child Health Department, Medical Division, National Research Centre, Cairo, Egypt

b Health Research Department, National Research Centre, Cairo, Egypt

c Medical Biochemistry Division, National Center for Radiation and Technology, Cairo, Egypt

it should read

Mones M. Abu Shadya, Hanan A. Fathyb, Alaa Alia, Eman R. Younessc, Gihan A. Fathya

a Child Health Department, Medical Division, National Research Centre, Cairo, Egypt

b Research Department, National Centre for Radiation Research and Technology, Atomic Energy Authority, Cairo, Egypt

c Medical Biochemistry Division, National Research Centre, Cairo, Egypt