Additional file 1.

Methotrexate knowledge questionnaire. This questionnaire includes 11 multiple-choice and true/false questions about methotrexate as well as two items (multiple choice) that test numeracy related to methotrexate dosing. The 135 subjects completed the questionnaire, and the number (%) of those who responded to each option is listed to the right of each response.

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Barton et al. Arthritis Research & Therapy 2013 15:R157   doi:10.1186/ar4340