TNF and rheumatoid arthritis: The risk of SSI was not significantly different between DMARDs, corticosteroid and anti-TNF-α in RA patients (DMARDs versus corticosteroid: odds ratio = 2.73, 95% confidence interval: 0.354–21.031; anti-TNF-α versus corticosteroid: odds ratio = 2.662, 95% confidence interval: 0.25–28.342; anti-TNF-α versus DMARDs: odds ratio = 0.862, 95% confidence interval: 0.291–2.548)27.