TNF and thromboangiitis obliterans: The goal of our study is to measure the levels of 10 cytokines (Interferon- γ (IFN-γ), interleukins IL-10, IL-12-p70, IL-13, IL-1β, IL-2, IL-4, IL-6, IL-8, Tumor necrosis factor-α (TNF-α) and soluble Interleukin-6 receptor (sIL-6R)) in TAO patients’ tears compared to control subjects.