Lung CD4+ T-cells in patients with lung fibrosis produce pro-fibrotic interleukin-13 together with interferon-γ.

Competing Interests: Conflict of interest: L.I.B. Sikkeland reports grants from Norwegian Respiratory Society sponsored by Boehringer Ingelheim, during the conduct of the study. Conflict of interest: S-W. Qiao has nothing to disclose. Conflict of interest: T. Ueland has nothing to disclose. Conflict of interest: O. Myrdal has nothing to disclose. Conflict of interest: Ł. Wyrozemski has nothing to disclose. Conflict of interest: P. Aukrust has nothing to disclose. Conflict of interest: F.L. Jahnsen has nothing to disclose. Conflict of interest: T. Sjåheim reports personal fees from Boehringer Ingelheim and Roche (speaker's honoraria), outside the submitted work. Conflict of interest: J. Kongerud has nothing to disclose. Conflict of interest: Ø. Molberg has nothing to disclose. Conflict of interest: M.B. Lund has nothing to disclose. Conflict of interest: E.S. Bækkevold has nothing to disclose.