TGFB1 and uveitis: Clinical Remission of Uveitis Is Associated With Higher Serum Levels of TGF-β and IL-10 and Lower Serum Levels of IFNγ, IL-17A, and IL-22 Compared With Active Disease, and Serum TGF-β and IL-10 Levels Positively Correlate With Treg Levels