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

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Ronald Friend and Robert M Bennett^*

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

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