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Kaplan‐Meier plot for persistence with matching weights, definition 3: similar to definition 2, but allowed a switch to another drug within the same class. TNFi = tumor necrosis factor inhibitor; MTX = methotrexate. Color figure can be viewed in the online issue, which is available at http://onlinelibrary.wiley.com/journal/doi/10.1002/acr.22944/abstract.
