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Distinguishing fibromyalgia from rheumatoid arthritis and systemic lupus in clinical questionnaires: an analysis of the revised Fibromyalgia Impact Questionnaire (FIQR) and its variant, the Symptom Impact Questionnaire (SIQR), along with pain locations

Ronald Friend and Robert M Bennett*

Arthritis Research & Therapy 2011, 13:R58  doi:10.1186/ar3311

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